Your estimate on software sales is correct. The 360 currently clearly beats the Wii on attachment rate (games sold divided by consoles sold). I'm not sure where the PS3 figures into all of this; in any case, Sony are the big losers of this console generation so far. Hardware that failed to live up to expectations (and the fiasco with IBM licensing some of the expensive tech to Microsoft, who then made it to market before Sony) generally relatively poor sales, etc.