There's a couple things:
I like the fact that it's normal to include royalties on secondary sales, I think that it much better for the artist.
I generally like generative art and there's really been a huge explosion in generative art being produced.
I already followed some of the artists that have minted and was excited to more fully participate by buying some of their NFTs
I don't find NFT ownership that different than high end physical art ownership (high end enough that you simply don't display it, but display a replica instead)
Lastly for the friends I have bought from, donating money and buying something are very different social interactions. IMO donating money creates an implicit power imbalance, there's a connitation of being owed something in return. Instead I am buying something from them, that is a market based interaction & while it has good feelings associated there is no power/reciprocity imbalance there. They aren't doing this for their full time job, just a fun hobby.