I think OP's comments might have some validity...
I'm in the process of upgrading my elite to a Jasper...and I will help boost 360 sales, but I'm not really increasing the customer base...maybe a non-360 owner will buy my old elite, but you never know. What I do know is that I has expected a serious boost in SW to compiment the HW sales.
As a rough poll, how many PS3 VGC members upgraded?