I think that for €10 to a good cause these are actually a really good deal. A few euros more to get it printed out at high quality on decent paper and you have something very cool for not much cost at all.
As for NFTs, I find them a bit bizarre. I guess that they are a cryptocurrency more than anything else, but I still don't really see the point. People paying millions (literally) for something that is freely available to view and share online anyway. It's odd.