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mrstickball said:
Given the fact the attach ratio for the PS3 is lower than the X360/Wii, I think that's a good place to start. It's about 30% lower, so some amount of that 30% is going to be in your 'doesn't game on it' group. How much? I am unsure.

Worldwide attach rates:  Wii=5.79    PS3=5.85   360=7.82

The PS3 attach rate is about the same as the Wii.  (actually slightly higher)

The 360 attach rate is higher, mostly because of the year head start.

There are certain number of PS3s owners that do not buy games, just like 360 and Wii.  I doubt there percentage if much different between them.