They simply don't have the money... Or rather, they do, but it's far more important they work towards profitability right now. They're only just now beginning to climb out of the hole, and it's best they don't screw it up by doing something rash.
There's no need for them to break the bank as it is with their absolute knock-out in the hardware department and slew of 1st party studios. It's far better they make their own exclusives and continue to grow their studios at this point, they're never going to win a bidding war against Microsoft on the big ones.







