The longer "no" answer is: no, there's effectively no secondary market. NFT trading is a small number of suckers, lured in by much larger amounts of (a) money

The longer "no" answer is: no, there's effectively no secondary market. NFT trading is a small number of suckers, lured in by much larger amounts of (a) money laundering - there's a lot of dirty ETH out there that's been turned into a slightly smaller amount of clean ETH by running it through a few sockpuppet NFT-trading accounts (b) wash trading. (I have a purported chat log from the creators of Cryptopunks claiming they wash-traded the cryptopunks to make it look like there was a secondary market. It came from a source I think highly of, but I can't claim to have authenticated the chat log as a smoking gun admission of wash trading.)