I wasnt even considering overcharging, just the fact that a foundry has to make a certain profit out of a product that it sold to MS, as I'm sure even MS understands. This profit is then included in the price of 360, and cannot be shaved off. If a foundry makes now 5$ profit for a chip that costs 40$, and the cost of the chip is cut to 40$, they will still want to make 5$ out of it, since they invested in new tech and so on... It's not much, but it adds up. Anyway, MS is in a much better position this time around, as ad least they own the desing. Swithching suppliers is not that easy - there are lots of QA issues that can make this shift actually more expensive.