I find it funny that some of you are bringing up attach rates as proof of anything.
The larger an install base gets, the more diluted it becomes. A 15% attach rate on 120m+ consoles is HUGE. Gran Turismo is the only other franchise that can even come close to those numbers.
In three or four years, remind me to show you how low the SMG, SSBB, Mario Kart, or Wii Fit attach numbers are because the Wii userbase will be so damned large, even though all of those games will sell extremely impressive amounts.
I guess most people just won't care about those titles and they won't be system sellers.

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