Wii U (especially WiiU) and 3DS have some serious attach rates

[Rustuv]

The game cube (another Nintendo under performer) had an average attach rate of like 8.9 games per owner the highest of any console.

Edit: I see some else has posted it was 9.2, he's probably right. I just know Gamecube holds the record.

Edit 2: damn 9.6 not 9.2.