Ps2 outsold ps3 and xbox360 in the month of feburary

[Mummelmann]

I think its reasonable to assume that 99$ price point helps a bit too...
Sony is not just making money on it; PS2 software is still a lot more lucrative than both PSP and PS3, possibly even if you combine the latter two.
Here in Norway, nearly 50% of game revenue last year was PS2 as far as I remember.