Hi Chris, personally for me, I like to see artworks made into prints and cards. It makes artwork more accessible to most people. I have also purchased original pieces too, so I think it’s probably prudent to list both in your shop if you can.
I’m not sure I totally agree with your comment about Folksy having a focus on “useful” rather than decorative items - if that was the case, my shop wouldn’t have been around very long! 