So that's what I am trying to build, the relationship where customer talks directly to a freelancers but as a marketplace we will provide billing, legal, payment processing. I want to enable freelancers to work in teams, and gain trust of big clients instead of few thousand bucks gigs.

I love how you described most of the agencies as a body shops, they truly are. You talk to a salesman instead of the team you want to work with. That would be the reason for many projects failing and being overpriced.