His films cost next to nothing to make, and he's flush enough that I'm sure he finances them himself. He is the "talent", the director/producer/in charge of blowjobs/etc...
Because of this, and his fame and therefore profitability of his product, he is in a pretty unique position to negotiate w/ Hollywood. I can't stand MM, not because of his politics but because I love documentary film and he has taken a giant schit on the art-form. His stuff really stinks to the high heavens and he is the most famous impostor ever in documentaries.