I have not read the entire thread but why in the hell we are comparing attach rates? Those things are almost 100% meaningless. Consoles with small userbases will have higher attach rates and vice versa. Also, just because a game has sold over 1 mil does not make it a success if the company that made the game had a huge budget behind the game and had high expectations(MGS4 comes to mind with the whole "sell 1 mil on the first day to be profitable").
On-topic: I do not think that I can add anything since everyone has already said what I wanted to say.
Proud owner of the following gaming devices:
PC, XBox 360, Wii, PS2, DS, PS3