I am not too convinced PS3 software is very profitable yet. I am including PSN in that mix.
By profitable, I mean specifically - financial statement profitability.
Especially if they are incurring huge development costs for newer/upcoming games. Because you account for expenses as they occur, while recognizing revenue when they occur.
In the games industry, there tends to be that 12 to 24 month lag.
So if Sony studios are trying to develop many EXCLUSIVE games, then those expenses will be up.
On the other hand, if they shutter or discontinue developing some games - then that would also reflect badly on their profit/loss statements.
As well, the PSN may also be sucking money from the games division, while not bringing in enough revenue to offset its costs.