Have you checked out Amie Street? They have a similar model. You can pick early tracks when they're unheard of and free. Then as they get more downloads they ga

Have you checked out Amie Street? They have a similar model. You can pick early tracks when they're unheard of and free. Then as they get more downloads they gather points and then you get points, like you have one share in the song. You can then spend these on buying different songs.