First I should say I am not a big fan of art in any of my fandoms, but I think that is because I started with QAF where I knew from day 1 exactly what the characters look like. And not only do we know what they look like, we know what they look like together so we don't need manips or sexual drawings of slash pairings. Most things in fandom (In my opinion of course) come from filling a void or satisfying a need for something or more of something. I don't think QAF has a void in the visual department or at least not a great enough one that many people want to fill it.