Film Review: 'Exit through the gift shop'

Just watched this (recorded from Channel 4). Thought it was a really interesting film, though not entirely sure what it was about. Started out as a documentary about a guy shooting footage of street artists, and ended up as a film about the same guy deciding that he was a street artist - and selling his stuff for impressive prices. It seemed to me that he was no more an artist than he was a documentary maker, but what do I know? Or anyone?

Interesting footage of art collectors drooling over street art - there aren't many kinds of rebellion that can't be co-opted, are there?