Gameplan Analysis: 1 of 4 Wii owners in NA plans to purchase SMG 2

[leatherhat]

Nintendogamer said:
So roughly 8.5M will definyl buy it, good stuff, wondr if it will hit 10 Million, it's possible that sequals can outselling it presucessor.

I don't think it works that way. Actually I have mo idea how this works. Is their an explanation for the numbers?