If you have the funds to get hooked up with a board manufacturer that actually makes good boards, then I say go for it.
Most skaters could give a fuck about the graffics, but if your decks are legit you might be able to pull a little following.
Just don't actually paint the decks, get them printed. Actual paint on a deck makes it hard to do railslides and tailslides and shit.
I wouldn't go into it expecting it to pay your bills, but a little suplimental income never hurt anybody.
Just don't charge any more than $25-$30 a deck if you're going to be selling out of your trunk.
And take measures to not let your boards get warped while they're sitting around (ie don't leave them in your trunk or sitting at fucked up angles).