I don't get it either, but I think I understand why people do. First is that collecting stuff can be fun. There's an element of the "thrill of the chase" track

I don't get it either, but I think I understand why people do. First is that collecting stuff can be fun. There's an element of the "thrill of the chase" tracking down individual items, and of discovering new things, and of completing a project of some kind. There's also sometimes an element of belonging to a community, The hobby of collecting becomes an activity in and or itself. Second is that it's not entirely about scarcity. Baseball cards are desirable because people like to follow sports and athletes and stats. Funko Pops are desirable because people like pop culture and want figurines of pop culture figures. Fine art is desirable because it ostensibly looks nice (or fits some other definition of "art"). Most NFTs are also "art" or otherwise visually interesting, and moreover represent some kind of techno-futuristic optimism that appeals to people. Of course, things get a little hairy once "real money" gets involved. There are orders of magnitude more money involved than, say, rare books or Magic: The Gathering cards, and the fact that everything is digital and highly liquid (in the financial sense) makes it all seem a lot more accessible. And of course that accessibility, coupled with the thing being poorly understood and widely hyped, makes it a uniquely tempting arena for scams and financial speculation.