Maybe others are different, but I can't think of one single thing I have bought due to seeing it on the tv. Does it add awareness? Yes. Does it make me purchase it? No.
With that said though...I don't think doing a "LITTLE" advertising on tv would be a bad thing. But they probably figure since it's included with the 80 GB sku it will sell plenty of copies over the following months.
PSN ID: Sorrow880
Gamertag: Sorrow80
Wii #: 8132 1076 3416 7450