Keep in mind that many people buying Wiis may be non-gamers who aren't all that interested in "gamer" games and others may be actual gamers that aren't Mario fans that were convinced to buy a Wii for other reasons (controller, Virtual Console etc.). Comparing the attach rate of a Mario game on a console prodominantly purchased by Nintendo fans with a Mario game on a console that's supposed to appeal to basically everyone in soceity isn't very accurate.
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Keep in mind that many people buying Wiis may be non-gamers who aren't all that interested in "gamer" games and others may be actual gamers that aren't Mario fans that were convinced to buy a Wii for other reasons (controller, Virtual Console etc.). Comparing the attach rate of a Mario game on a console prodominantly purchased by Nintendo fans with a Mario game on a console that's supposed to appeal to basically everyone in soceity isn't very accurate.