I have also worked with other "artists" outside of the professional marketing scene for things like posters, video's etc. -They suck. Most graphic artists that aren't in professional marketing are lazy, ill equipt and unimaginative.
All this said, it's worth noting that my insanely talented friend that branded your Mac 'N Cheese is so fed up with corporate America that he recently left his job and he and his girlfriend are going to live on a CSA farm for a year and own shares in the crop. He threw away a nice salary at a very reputable firm to go get his hands dirty and re-connect.
To your larger point: Supply is going to get heavy as people like my cousin's boyfriend start flooding the art scene again. But let's face it, Renior and Van Gogh aren't making any new work any time soon. I think for the sake of argument, we need to separate this top 10 list from the contemporary art scene. It's like saying that an original copy of the declaration of independence will someday depreciate. -It very well might, but it's far less likely than a Damien Hirst piece depreciating. Two very different conversations.
I'm part of an art "experiment" that I'm not at liberty to discuss right now. Give it six months or so. It'll be interesting to see how it turns out. I don't think we're going to singlehandedly pop the "art" bubble. But I think that there will be money made. -Color me curious. Look forward to hearing more when it's appropriate and wish you well in your endeavors. lets get some PM :)
Aside: the rarest thing I've found in the music/art world is someone that is prepared, on time and passionate. I hate that having dread-locks and a conga drum somehow make you an artist, even though you show up late, are stoned beyond function and have no sense of purpose. (by the way many conga players with dreadlocks are artists and very talented ones, I just went to school in Missoula and I'm jaded.) -End of rant.