The movie is essentially about how stupid people are when it comes to art. The filmmaker is a wacko who has no background in art at all, and follows around graffiti artists for a few years. Then he decides he's gonna give it a shot himself, spends a lot of money to have graphic designers print him out posters that he puts up all over LA, creates a lot of fake buzz about his art, puts on a show, and sells a million bucks of "art" crap to stupid herd mentality people that think it's great even though it's basically a mockery of the whole street art thing.
I couldnt tell if he purposely did it, or is just really stupid and thought he was great. I'd like to give him the benefit of the doubt, but there's at least a 75% chance he's a huge doofus.