even collectors for other mediums of value are generally collecting so they can sell it to someone else later.. if i offered you the mona lisa for 1 million you probably wouldn't want it if i stipulated that you could not under any circumstances sell or profit from having it. 1m is a lot of money for something that just sits in your living room and is nice to have.
if you could profit from it then you'd take out a mortgage and then resell it for at least 100m extra.
of course these things are a little different right now, but whos to say they will always be that way? cryptopunks, bored apes, and even curio cards are selling at Christie's and Sotheby's these days. 4 months ago you could buy a bored ape for 1 eth... now the floor on them (cheapest one you can buy) is 40 eth.
https://www.theverge.com/2021/5/11/2...ale-larva-labs
https://www.sothebys.com/en/buy/auction/2021/ape-in
https://news.bitcoin.com/british-auc...-on-october-1/