ME2 has been available for $10 on PC and 360 for a while, and as I understand it all PS3 gamers also have a strong gaming PC, something that they like to remind everyone anytime a 360 game that is also on PC is called an exclusive. So the logical conclusion to me is that they have all played this on their gaming pc for $10, and got a much better looking version than on consoles in the process.
Yes, well, obviously!
Anyway, I expect ME2 will do pretty decent throughout the year, especially as the hype builds up towards ME3, people with PS3s who never played ME2 will start picking it up.
It's interesting that they also sell the full game from PSN by the way in the US and the UK. Pricing isn't great though, you'd need two PS3s like patsu to benefit from it, or share it somehow with a friend if that is even possible ...But I applaud any full game PSN release, because I personally like the option to install games on HDD, though perhaps an offline game like ME2 isn't as high on my priority list as any game that does have online functionality. The more online a game is, the more I like to have it on my HDD and not need to put a disc in.