What's the most expensive thing you've come to own that you've never gotten to fully use?

I got a pretty nice Yamaha bluray player that was an appropriate match to my home theatre amp.
Put a bluray in it, got a piracy warning, a few unskippable ads for other movies, an obnoxious excessively drawn out animated menu screen that stuttered like hell and was laggy to use.
Pulled the bluray back out of it, stuck it back in the DVD drawer and proceeded to download a copy of the movie to watch. Been doing that ever since.
- Wanted to re-watched something I couldn't find on torrents in good quality, so I bought a cheap Blu-ray player and holy shit it was painful.
  I'd forgotten how annoying all the warnings and menus were; JUST PLAY THE BLOODY SHOW!
  
  As great as just playing the show is, I actually really like DVD/Blu-ray menus because of the little extras you get on some of them. It makes the disk feel more special compared to straight up video files on a storage device. The warnings can be a little annoying, but otherwise I don't mind as much.
  Also, I'm lucky enough to have yet to find a DVD/Blu-ray that stutters or has audio glitches on the Vizio Blu-ray player I got at a thrift store, so I'm lucky.
- Sony really knows how to fuck up an experience and shove their own consumer around
- Sell it, dude
- That's why I only buy collector's edition blurays. At least it has the extra stuff that's worth the money.

3d printer
- Get to it! Such a fun hobby
  
  I have promised it to my brother as its a resin printer and he paints warhammer
  
  not much use. mostly to rarely print a few bits and pieces when i need a repair or something very specific for a project.
- As someone who has been in the 3d printing space for awhile, I am amazed at how cheap and featured the entry level printers are. For ~$150 you can get a printer with auto bed leveling and a magnetic bed. At $15/lb of filament, you only need a few projects to pay for itself.
  For example, I printed the housing for a USB hub for a friend which is a clone for a ridiculously expensive one that fits Lovesac couches and he paid me $50. It cost ~$2 of filament and ended up printing a few more for others. That alone paid for the cost of the printer.
  For anyone who is thinking about it, now is a great time to enter the hobby.
  
  Which cad software do you use? I've been jumping from blender, openscad, and freecad

First edition, first run of the three Lord of the Rings books.
I can’t bring myself to open them up and mess with the pages.
- The duality of book owning.
- I mean, yeah. The point of collectibles like that is in owning the thing, not using the thing. Read the ebook instead.
  Or the BBC radio play, which is the best version of LotR ever, including the original books and films, and I'll die on that hill.
- But you bought a reading copy as well, right?
  Right?
  
  I have one, but it’s not the same as the original.
  I have posted pictures of the books for people who want to see the original maps included in the books.

A pool. It came with the house, but damn is it expensive to maintain. I say I've never gotten full use out of it because I spend way more time and energy maintaining it, than I do using it.
- Rent it out for parties like Airbnb for pools and you can recoup the cost.
  
  I believe there was someone on Shark Tank trying to get funding for an app to let people do that. If I remember correctly he did not get funded.
  I would also assume there are some legal obligations with that. Like having to have lifeguards or other safety measures a public pool is required, that a house would not have.
  Plus people are gross. I'm sure this would only increase the amount of cleaning I would need to do.
- Sounds like you need to invest in fixing it up. Big short term cost vs death by a thousand cuts
  
  It's not really that it needs to be fixed up. The chemicals and supplies are outrageously overpriced. Then there always seems to be some major issue every year or two. I've lived in the house for 7 years and have had to replace the control board and the pump. I had to replace $2,500 worth of piping after Texas cut my power for 3 days during freezing temperatures. Then last summer it was so hot the ground shifted and it broke two return lines that had to be repaired through the concrete deck. And I know by next year it will be due for resurfacing.
- Our house used to have a hot tub and still has the concrete pad, electrical hookup, and other equipment necessary to run the hot tub. I have never been interested in maintaining it. Can't even do naked hot tubbing because the neighbor's house looks right over the hot tub pad.
  
  Why not invest in a canopy?
- This was my criteria for buying a house : no pool !
  
  Smart man. My wife convinced me to get it swearing she would take care of it. Apparently her idea of taking care of it was to hire someone for $350 a month. And that price didn't include the chemicals.

I have a college degree I have never used. It wasn't cheap even tho much of it was paid with grants.
- Art?
  
  Nah, gotta be music/sound related

Probably 500+ bottles of expensive wine, more possibly even. Some of it was free, but most not, and it's all crammed into a 2 bedroom apartment turning to vinegar because it's improperly stored. Sometimes life circumstances mean you can't drink much anymore. So it's pretty much a waste and hugely embarrassing.
Never tie your finances to that of a crazy liar.
- Never tie your finances to that of a crazy liar.
  I'm invested and would like to read the rest of the story..
  
  In a nutshell I married a person who has destroyed me financially a few times over, and I cannot leave because I don't have the money. He's sort of like a narcissist (like in that vein, not fully but definitely very mentally disturbed), and he decided to get into wine and buy massive quantities simply to make me angry and ruin my life out of spite, after he destroyed my mental health. We had storage space for it at the previous house but got evicted by a landlord who took it back for his family member, and now I live crammed into a two bedroom apartment with 78 boxes of wine that I seldom if ever drink. He ensures he gets everything he wants in life, even when I was down to owning 3 pairs of pants.
  It's incredibly sad and depressing and I can do virtually nothing about it but drag myself between both jobs, spending zero dollars save for my survey money, while he sits on the couch watching hockey 3 hours a night. I have no support and no way out but praying I somehow find time and a plan to make my own business and make enough money to dig out and find somewhere to hide from him.
  If you have a red flag in a relationship, run. Not worth it.
- Some of that can sell at auction, I work on a house where the lady inherited about $300,000 of wine.
  
  I would be hanging from a lamppost somewhere if I tried it.

Speaking on my wife's behalf, an epipen. We're both content with not having needed to use it.

My Switch. Just lost interest after playing a few games
- Sell it and buy a steam deck. I'm over 40. The deck made me like gaming again. So many fun games and immediately being able to sleep the system while in a game and then waking it back up to be right where I left off is a huge benefit to me.
- The terrible state of online play ruined everything nintendo for me.

My house. There has never been a point in time where there was not at least one room unusable due to ongoing renovation.
- How do you keep having renovations? How do you even sustain that?
  
  Bought a fixer-upper and my wife is a lot more aggressive about starting projects than she is about finishing them.
  
  They might have bought a "project house" and went the DIY route. Especially big country house, etc. In France I knew folks that bought a super cheap "small" castle, and have been constantly renovating for years and years. For example when up keeping the windows, by the time they get to the last one they can already start over with the first one again.
- Same. I bought a fixer upper and haven't moved in yet due to the very messy renovations I'm doing slowly on evenings and weekends after my full-time job. I'm almost to the point I can move in though.

Bought a brand new truck for my in-laws. Only brand new vehicle I've ever bought in my life. I get to drive it for a month every couple of years.
- Not a total loss...
  
  I mean, they've gotten a lot of use out of it which is cool.

My mixing studio monitors, I haven't properly gotten into mixing yet.
- Years ago when I worked in audio production I would sometimes just sit in my studio to listen to music on my monitors. They're technically not supposed to sound "better" but they certainly tend to sound more detailed. If you're too busy to mix, you could at least do that. (Plus you'll get a better frame of reference for the monitors/room.)
  
  Yeah I think the idea is they sound more "accurate" as "better" is a subjective term. I do this too, I love them.
- I just got a pair a Kali IN8 monitors last Friday. I play music, and have enough equipment to record, and want to, but I have spent hours just listening to music through them. The fidelity is insane, so if I only ever use them for listening to already produced music, they will still have been worth the money.

Back in December I spent $550 on a refurbrished home theater projector. After actually thinking things through, I realized that in my current living situation, the whole idea isn't going to work. I went back to watching movies on my TV and sometimes even my monitor.
I still haven't taken the projector out of the plastic wrapping, and I've been contemplating re-selling it on eBay so I can at least get my money back...but I highly doubt that will happen.
- I’ll give you $225 for it. ;)
  
  I'll go tree fiddy
- can you use it in the backyard?

My Les Paul. I go in fits and spurts with learning to play the guitar, and haven't gotten around to figuring out the effects of all combinations of the volume & control knobs.
- Just play it, my dude. I bought a fancy PRS because it fit my hands right, and it had a ding on the neck so the guy didn’t want it.
  I straight up suck at guitar and can only play shitty 90’s alt and some pentatonic stuff, but it’s still fun.
  If you want to get better at just making stuff up on the guitar, learn the pentatonic scale, pick four to six notes, and just jam with those notes. I like (2) 4-6, (3) 4-6, and (4) 4-6. You can bounce around between those and sound pretty cool.
  
  This is helpful, thanks! I've been using Justin Guitar to learn, and have only learned one pentatonic so far, but I'm interested to learn others. Cheers!
- Why buy a Les Paul of all things if you're still learning?
  
  It was on sale, and prior to that I had a shitty acoustic which was zero fun to play, so I wanted something nicer that would last me a long time.
- I would 100% recommend taking lessons. I waited 25 years to start lessons and wish I'd done it much sooner. It's amazing how much you can improve in 6 months. And even professional touring musicians in really big bands still take lessons. It's only theoretically possible to self teach yourself, but practically very hard, especially if you have no musical background. If nothing else it gives you a motivation to practice whatever you've been set the previous 1 or 2 weeks.
  
  I agree, but I'm retired, so to save money I'm learning via Justin Guitar, which is actually pretty awesome :)

My car's extended warranty.
- They finally tracked you down huh

I bought some kit for running TTRPGs just before COVID hit: wet erase markers, Chessex mat, extra dice bags, DM screen, and some cheap minis. Then when COVID hit I adopted a Virtual tabletop (Foundry). Over the course of the pandemic, my gaming group evolved to include people from all over the province, and so now there's not really any hope of playing an in-person session. Not to mention I switched to playing PF2E, which is really hard to run in-person because of how much crunchier it is. So now I have this stuff and don't really know when I will get to use it.
- As a lifelong customer of Dwarven Forge, I understand your pain.

Akai EWI Solo
My partner insisted on getting me one of these as a gift because I like playing music. It's cool for sure, and I enjoyed the little bit I've played on it, but there's just no time. So it's left to gather dust now.
- I paid around US$700-800 for a nice Neumann mic that I'd researched pretty well, but like a dumbass didn't realise that it required power, meaning I couldn't just hook in to my amp like your basic Shure.
  So later on as a solution, I got myself a Focusrite powered amp-interface that has a bonus of being able to route guitar and mic input in to USB. Spent hours trying to get everything working and kept running in to problems. IIRC the USB signal was barely received by my computer, and the only way the amp received a signal is if the computer was powering the thing, which shouldn't have been a requirement as it already had power.
  I just went back to my Shure while that fancy stuff gathers dust. Similar thing with my Ableton.
- I mean I could Google but what is it, what drew you to it
  
  Not OP, but EWI is Electronic Wind Instrument. It’s basically a fancy MIDI controller/synthesizer in a clarinet-like format.

I suppose the anti cat gate. Got it because new kitten wasn't getting along with adult cat. Kitten continued to not get along despite doing everything and asking the vet for more advice.
Kitten is with my mother and her cats and he gets along with both of them.
The anti cat gate stands there, expensively.
- The anti cat gate stands there, expensively.
  Lol I'm feeling the stare from here

I've just built a $1200 PC and I'm pretty sure I don't really use the fraction of its power.
- At least that means you'll be able to use it for a long time. Also, it won't ever overheat so it's not very likely to break down.
  
  yeah, that was the main goal, a PC for another at least 10 years, I don't do too much gaming on PC anyway, so that's not a push to upgrade more recently than this.
  My Dell Inspiron 7520 served really well, but had to upgrade sooner or later.
- I know the feeling. I payed for a new computer with specs higher than needed for any new release game at full settings, and yet the main game I have played on it so far was built for Windows 3 and is best played in a web browser.
  
  Same, my main game is Half-Life (Sven Co-op) and Half-Life 2 (Synergy) 😅

My 6-foot-tall telescope. I should really pull it out more, I just get so busy.

I bought an $800 half stack guitar amplifier in 2009 and rarely play with the volume above 1, let alone play shows with it. But it looks neat.

A pair of traditional leather boots that were stiff and sturdy enough to support me through anything and last long enough to be buy it for life. The pair weighed over 5 pounds. After 6 months they still hurt after a hike and I gave up breaking them in. Cost me over 300€, and I replaced them with a pair of 80€ trail running shoes which were better in every way for my use case and also lasted 12 years.
- You should've wet them completely, preferably while wearing and stretching them.
  But that can be a real pain, yeah.
  https://drewsboots.com/blogs/news/how-to-break-in-leather-boots
  Had to do it a few times while in the army.
  
  I did. The problem was, they weren't too tight but too wide at the heel, so my heel kept rubbing up and down in them.

Xbox Series X. I have a Day 1 release, and recently cancelled my XBL Gold + Game Pass due to lack of use.
- Been playing PC or PS5 games instead? Or just haven't been gaming much?
  
  Actually, Nintendo Switch, mainly because I can take it anywhere. I just don’t find myself with heaps of time to sit down for proper gaming sessions any more.
  The tyranny of getting older, and having family responsibilities.

90% of people here would have to say "my car".
- What would be some commonly unused features?
  
  The 200hp engine to move the metal box at a speed of 15 kmh in city traffic from one red light to the next...
  
  Driving it, believe it or not. Even a car that's used to commute to work every day still sits parked most of the day.

2020 Shelby Mustang GT350R. I paid $80k for it and then another $25k at Shelby American in Vegas for the signature edition package. Bought it new in 2020 and it now has about 1500 miles on it.
It was my dream car but I just never have the time to drive it.
- Trust me, it will go up in value... In 2070.

A Fender Telecaster. I love it, but my health isn't good enough to let me play on it very much. Plus, I sometimes wonder if I should've gone for a lighter guitar...
- I've never used any fret above the 17th on the bottom 3 strings of any guitar I've owned. Teles aren't known for being particularly heavy, what would you think of replacing it with?
  
  It certainly seems heavy to me. I'm not entirely certain what I'd replace it with. If money were no object and it didn't have f holes then I'd probably get a thinking Tele.

An ecoflow battery generator. Granted, it's a small-ish one but I got this itch to purchase one after seeing one in action while car camping ("I can use my hot water kettle while camping, how cool!") and when our city was warning us about widespread power outages from an upcoming winter storm ("to keep our devices powered up").

My camera (Nikon Z6) has a lot of features I never use and probably never will. Bit it's still an amazing camera that I can use to take photos with that I couldn't with other Nikon cameras I could afford. So it doesn't matter if it has a weird feature I don't use when I regularly make use of a feature it does so well. Paired with an old 70-200 2.8 I have taken a lot of photos I would have previously not have dreamed possible with my older camera setups.

Fully use? Synthesizers. I just don't think that's possible.
Otherwise, I'm pretty good about using the things I buy. Maybe my HOTAS and Race Wheel, as those are the most niche gaming things I have. But price/per use is still not that bad, I put a lot of time into some of those games, I'm just not actively playing them as much anymore.

A Honda 2200 generator.

Ive gotten a sub woofer probably at ~$120 of value and a couple pool sticks (billiards) at ~$200-300 value of which I've never gotten to fully utilize yet