Several independent game developers do this without the payback system. World of Goo and Machinarium are two examples of games available through all sorts of bu

Several independent game developers do this without the payback system. World of Goo and Machinarium are two examples of games available through all sorts of bundle packages and pay-what-you-like experiments. They're also examples of developers who have declared 90%+ piracy, so I'm not sure that this anecdotal evidence has any value.