Why do you sell your art? people could screenshot it and keep it either way.
It’s different. Saving it on your phone or on your computer, you could easily forget about it or it could get lost, selling it as prints or stickers or anything else, holds a more special purpose, I guess? It’s easier and doesn’t cost you anything to save it on your device and have it anyway, but paying for a print, having a printed version of the artwork that you really like? From the artist that you admire? I am speaking as a fan of many great artists that helped me through my journey, not as an artist myself when I say this. But just makes me happy knowing that I have that artwork and that I am also showing my support to that artist. Some people appreciate an artwork or an artist, so much that they want to have it on their wall, or on a tshirt, or on a mug, whatever, yes, some people appreciate an artist enough to spend their money on them and show that they support, that they like that artist’s work. I guess that’s why.