Wii sports is bundled outside Japan (don't you people know anything?), but you have to count Wii sports in the numbers, since otherwise people would buy it/some other game to go with Wii.
360 attach rate is so high because it has a year headstart and it had a good start, but HW sales have declined since then. So the 360 owners buy games as they normally do (keeping the SW sales at a normal rate), while less people buy the hardware (good HW sales doesn't drop the SW ratio).
Basically that was just M$:s PR, they turned a bad thing to look good. :)
Btw. those VGChartz numbers aren't the WW attach ratios.
Ei Kiinasti.
Eikä Japanisti.
Vaan pannaan jalalla koreasti.
Nintendo games sell only on Nintendo system.