nfts are price neutral: someone buys tezos to buy jpegs -> artist dumps tezos to buy stuff. Or, someone gets staking rewards and instead of dumping them, buys jpegs (to flip, or for art) and that tezos then being dumped by artists (so consequences are same) Artists will sell profits from jpegs for sure. By buying jpegs for xtz, you are long on artist (not xtz), so you get exactly what expected