This is a magical make believe situation that NFT people cooked up to pretend that NFTs could have value. It's very unlikely that this make believe situation will actually pan out in reality because then you're making a weird art trade market where people are reselling novelty. And then the only value the artist gets relies on a nonsense "revenue sharing" of NFTs where each resale gives back a portion to the original creator. Which doesn't even make sense because then the value of the NFT has to fluctuate so that people can recoup their losses/get actual gains.
> This is a magical make believe situation that NFT people cooked up to pretend that NFTs could have value
it's the same magic value assigned to art pieces themselves.
It doesn't matter whether those buyers of NFTs make a profit or not - i don't care. I personally don't believe NFTs have value, but i can understand how other people could believe they do.
So selling NFT is indeed a separate source of revenue from donations.