But the silly-picture-selling crowd doesn't want to store their pictures in a offchain layer. They want them in a highly secure bank-vault, which the Bitcoin blockchain provides. That's probably what will give them their "value".
True enough. They're also not going to waste time to try and genuinely optimise their infrastructure if the primary goal is simply to offload the memes to the next sap and move on to a new swindle (that looks and sounds like all their old swindles, but bundled in a shiny new wrapper with the latest jargon and buzzwords). Pump shit -> Dump shit -> Move on -> Repeat.
But from the point of view of those more technically intelligent collectors, there would probably be more value in NFTs inscribed in the most secure Blockchain in the world than those merely minted in an off-chain layer. I might be the stupid one, but if I wanted to collect dick pics, I would only want them inscribed on-chain, in the Bitcoin blockchain.