I think sega is doing pretty well with the pc with their football manager and total war series.
ea is also doing fine ... I think they had a revenue of ~$1.1billion for ps360 each for fy 2013.
pc revenue sits at ~$900mio. So it only has $200mio less revenue, but they didn't have to pay idk how much money to sony/ms in licence costs.
So its obviously more than just 25% of the sales.







