It depends how you do it. Ultralight gear is definitely more expensive because the designers use more expensive materials and really sweat the details. It's also a lower-volume niche market than traditional camping/hiking gear.
Generally, yes, often an order of magnitude more expensive. A 4 pound tent you can probably get for a few bucks at a yard sale, but a 1 pound tent is probably $500. Walmart probably has 4-5 pound backpacks for $50, but a 1 pound backpack is going to be like $200-300.
That being said, a lot of it is mentality. Carrying lighter food, not carrying too much water, not bringing extra clothes.
Also, it's totally possible to make your own ultralight gear for a big discount. I got into sewing and have made several decent 1.8 pound 50L packs for only about $80 a pop. Check out https://learnmyog.com/
I’d say gear is more expensive, often much more expensive.
But UL often means less gear, so I guess that should be considered too. What I means is that you don’t need to buy a whole Triangia kitchen - just a burner, you don’t need a whole wardrobe of clothes - just the bare essential, etc.
I think it depends on the choices you make. For each expensive option there is usually a decent cheap option. Most people associate ultralight with over-engineered DCF and carbon fiber tents that cost $1000, but a sub-$100 tarp can work as well.
For me ultralight became a compromise of cost and enjoyment. I have a pretty small frame a slight shoulder injury. A lighter pack isnt as painful and much easier for me to balance. My first trip I had over 1/3 of my body weight on my back and that certainly took its toll and took away from the experience I wanted.
As much as ultralight gear is expensive, I do find its quality to be pretty good. Taking care of your ultralight equipment will often lead to a lifetime of service.
I lurked the ultralight subreddit to help me with mindset and brands to look for. My first trip i had like 2 or 3 knives, a saw and a hatchet but didnt even have a fire. My best resource was buying my own scale and weighing all my gear and putting it into a spreadsheet. Then i could plan trips and get a good idea for weight just using the spread sheet to add up my estimated weight.
Yes, I would say it generally costs more. But it doesn't have to.
For example, ultralight tents are expensive, so I embraced tarp life. My tarp and bivy are lighter than most UL tents and cost hundreds of dollars less.
My individual pieces of clothing cost more, but adopting an ultralight approach means I don't carry needless extras, so I don't buy as many clothes in the first place.
UL stoves can cost a lot, but the BRS stove or an alcohol stove are cheap and weigh less. Eating cold food is even lighter.
You get the idea. It costs exactly what you spend on it. It can be done affordabley if you are strict about what you are carrying and strategic with purchases. Leaving unneeded items at home will have a bigger impact on your base weight than any $700 tent.
I did at one point. Let me see if I can track it down. Fair warning, part of my UL motivation is saving weight for luxuries like a kindle and deodorant.
We had a baby in March so I haven't been on a trip since last fall. Hoping to do a few more sections of the MST this September.
Edit: I found my old lighterpack account, but the most recent packing list is from a few years ago. I should probably be responsible and make one for current trips. I'll send you another reply in a day or two with an update.
In the meantime here's my lighter pack from a lightweight hammock trip.. I've since decided I prefer the ground and switched to a quilt, pad, tarp, and bivy. I traded the pocket rocket for an alcohol stove (safe over here in the super damp southern US). I also cut some unnecessary weight from the FAC, cooking tools, ditty bag, etc.
I still owe you a lighterpack and I've been slow about getting around to it. I pulled out all my stuff in preparation for an upcoming trip and weighed it.
It's not down to ultralight weights, but it's not far off if you drop the luxury items and some extra clothes. I'm debating switching to a smaller pack. I've carried all this same kit in a Cotopaxi 20L climbing pack that weighs about 10 oz less. The gorilla is more comfortable though, especially if it's dry and I have to carry more water.
Edit: Here's a version without the unnecessary extras. It comes in at just over 9lbs base weight. Depending on the weather I would need to switch back to a real rain jacket. This is what I carried on a 3 day skateboard trip last year. https://lighterpack.com/r/j7iwjy