I want to show off the albums I bought to the world, ideally with some way to prove that I really spent money on them.
The albums are comparable to NFTs (though fungibility is arguable in both cases), with the caveat that the Bandcamp system is entirely centralized. If the company goes bust, so does my collection.
Though I appreciate that their ethics kept them from doing it, if anyone should've jumped on the NFT wagon, it should've been them. This would've detached the proof of ownership from the company and allowed a secondary market to exist (also important, should the company stop existing/change terms).