What would you pay for a set of games?

The band Radiohead once did this and this is the second time that an indie game developer is doing this. It's the humble indie game bundle, where you get to choose how much you would pay for a set of 5 games and they are posting live information on the how much people are paying and by what platform. The trend seems to be the average "donation" is Linux > Mac > Windows. Where Linux users pay 2.5x more than what people pay on the Windows platform. Ironic that people that use a free OS would pay more for software.