My kid brother played it over a decade ago and yeah I didn't get the appeal at all, but from what I could tell it was just lil minigame mods like Garry's Mod
I don't see how something like this would provide a better shopping experience for consumers then just going straight to wallmart.com or amazon.com or any other storefront accessible through a web browser. The only thing different is that its happening on the Roblox client (not a web browser or dedicated app) and you get a virtual item alongside the physical item (not saying the digital accessories are bad but they're definitely not much of a "perk" of purchasing through the Roblox client.)