The best answer is the 360 has a much larger userbase than the PS3. Some multi-plats sell less on the Wii because they aren't very good Wii games. Just read any of the Nintendo threads and you will see what I am referring to. Dead Rising would be a good one to look at.
I think a better question for your thread is why doesn't the 360 outsell the PS3 version all of the time?
Thanks for the input, Jeff.







