I don't think anybody would compalain if the MSRP turned out to be $50. Even $100, while it might draw some grumbling, is pretty comparable to the price of Wii Fit.
I guess I'm just trying to think of a circumstance where people would complain about the price being too low. I do tend to find the idea subsidized (loss-leading) goods distasteful, but I'm a little weird in that respect, and I doubt there are many others who share my opinion.
So I don't really agree that any amount would be too much, except of course for people who detest Microsoft or motion controls.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.
