I buy a picture from you, I get a receipt proving I bought it.
I buy a picture from you on an NFT marketplace, I get an NFT proving I bought it.
What value does an NFT provide in this case? I guess it provides a better proof of the purchase but that hardly seems worth the effort of setting up a wallet and acquiring crypto (for the average person at least). Not to mention the seller also needs to do these things, and I fail to see how he will benefit in this case.
Maybe in a hypothetical world where everyone uses crypto this will make more sense.