I'd like to point out that art bought on Gaia is for a totally different purpose than art bought in real life (with the exception of vanity art like caricatures, which are basically the same purpose as avi art.)
Art in real life is bought so you can take it home with you, put it in your house, and look at it whenever you want. With digital art, unless people watermark their stuff, any piece of art you like you can just save to your computer and look at it whenever you want, no payment necessary. Actually buying it is only necessary if you want to 1. Display it as a status or vanity item 2. Get a custom-made piece or someone to custom-color your own drawing, in which case you are mainly paying for the service, or 3. Get a B/C or RP pet, in which case you are paying partly for service and partly for membership in a community.
So yeah, I sell CG art, and it's not that high quality, but then I sell mine pretty cheap. It actually takes long to color than if I were using markers and pens, about the same time as if I was doing watercolor, but the result is shinier than either. In trying out to be a colorist for various shops I've found that there's prejudice within the realm of CG art too - I do texture-based art and a lot of shop owners seem to only be interested in solid colors with soft shading. They are welcome to have their preference, it doesn't bug me except I wish they would say so at the beginning so I don't waste my time coloring their examples. Customers, pleasantly, don't seem to have the same prejudice - when I worked at one shop as a colorist alongside a colorist doing the solid color/soft shading thing our pets sold equally well.
Given my personal preferences, I would be a socialist and live in a world without money, where the only reward for making art would be praise/popularity, But since I have to live in a capitalist world, I at least find satisfaction in knowing that if people pay for my stuff, it's because they like it, and I try to brainstorm what customers would think is really cool (and thus pay more for.) Does that result in 'higher quality' art? Not directly, although I think it's totally debatable what 'quality' art is - I hate realism, so anyone whose definition of high quality art is art that is the most accurate depiction of reality, I don't agree at all. But I don't really care about an abstract definition of quality - I care about making customers go, "OMG how cool!!!" And that kind of thing is particularly easy to do in digital art through the use of textures and filters to make pets that sparkle like gemstones, have skin made out of pearls or imprinted with circuits, or fur made out of billowing flames or lightning and stormclouds.