Hmm. Very interesting idea:

The system is simple: an artist states how much money she wants for her work, and people who want to support that work donate money to a fund for its free release, which we set up. When the amount is reached, OpenCulture pays the artist, and the work becomes freely available to the public. People who have donated to that work get it a little earlier than everyone else. We cover our expenses by taking 10% of each new donation.