Folks aren't buying a verified unique token for obscene amounts just to brag about it. They might brag, but many have other reasons to hold an object of such "value" .
Anyone thinking that NFT is anything other than a vanity token for the wealthy and a money laundering mechanism for the same is fooling themselves.
Re: wash trading, that also happens in the art world with shell companies.
* Tokens can become tickets to events
* Tokens can become options on commissioned work
* Tokens can become signs of membership
Because the token is guaranteed to be unique, and you can track ownership, there's a fluidity to this that lets you do away with contractual mechanisms. You can reuse the same tokens many times or announce that it will expire(for your use case).
Edit: And platforms can't really own it if it's on a public chain, too. You just copy the chain(see: BinancePunks copying CryptoPunks). So there's that.
Yes, using crypto and blockchain you can prove that this was the first NFT print of the artwork, but that's it. It's an expensive way to proclaim that you have the keys controlling the NFT that links to the print of the artwork, and that it was associated with a crypto-denominated transaction of a certain value, but that's it.
These NFTs are also a goldmine for wash trading scams. NFT holders can "sell" the NFT to themselves over and over again at increasingly higher prices, creating an illusion of a very valuable and high-demand NFT.
Want to own an expensive NFT? Buy a cheap NFT, then use a second wallet to "buy" it from yourself. The last trade price gets recorded in the blockchain and you can now brag about having an NFT worth as much money as you were willing to scrounge up for the transaction.