Sony gets around $34 for every first party title they sell at $60:
http://vgchartz.com/forum/thread.php?id=102058
Let's say they only sold 2 million copies at $60. That'd put them at ~$70 million in revenue not counting the other 300k and counting units they're shipping. Estimates peg the game as having a $40-50 million development budget (just shy of MGS4), which would imply the game has preformed quite nicely.