If we are going to approach the issue through analogies, here's an alternative one: selling an NFT is like the old scam of selling a bill of goods (this is where the victim thinks he has bought a number of tangible things, but the contract actually says that all he has bought is the document listing the goods.)

The big difference with NFTs, of course, is that the true nature of the transaction is not being disguised. That makes it legal and even ethical, but whether that is enough for you to be a buyer is up to you.