I don't know why people always argue that if a game sells poorly on the PS3, it must be because of the smaller install base than the 360.
If you look at it, with the relatively smaller game library of the PS3, it should definitely have a higher attachment rate than the X360 which has a larger library of games.
As a platform increases it's games library, it's attachment rate naturally decreases. In a platform with a relatively small library of games and the market not saturated yet, I expect Uncharted, R&C, etc... considering they are AAA+ titles, to have an attachment rate of no less than 20% in the first 2 weeks. That's why I think Uncharted and the likes aren't really selling good. They're selling decently but not good.







