The RATIONAL Street Performer Protocol is even better http://www.logarithmic.net/pfh/rspp

And that's the closest of the various older theoretical models to the proposed solution of Crowdmatching being worked on at https://snowdrift.coop

I'd like to see crowdfunding move in this direction, but it'd be too good, right? Calculate that a project takes $100k, amass the backing, then release the finished work for the benefit of the whole world. What happens instead of release is that the makers just keep it all closed and try to make further profit.

mycli used this model, read about their experience here: https://www.mycli.net/kickstarter