Wait you are saying the legs have same attach rate?
When SMS launched, there were 1,5M GCs in Japan ( soruce: http://vgchartz.com/japweekly.php?date=37458)
When SMG launched there were 3,8M wiis in Japan (source: http://vgchartz.com/japweekly.php?date=39390&console=&maker=&disp=American+Name&boxartz=1)
During its first week SMS sold 338K. This means about 23 % of all GC owners bought SMS in its first week. Impressive huh?
During its first week SMG sold 260k. That means about 7 % of all Wii owners bought SMG in its first week.
During its first 6 weeks, SMS had sold 622K, which means about 42 % of all GC owners had bought SMS.
During its first 6 weeks, SMG had sold 505K, which means about 14 % of all Wii owners had bought SMG.
Further math, would unfortunately, be unfair to SMS since SMG would get Chrismas boost.
I fail to see how 14 % = 42 %. I thought it was a third, but hey, I'm just 14, I'm probably wrong...
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS