My point is that it is not as simple to pirate on the PC, not that it is impossible or it isn't a problem. The issue is Starcraft, a PC-only AAA title, has sold only 3 million games. This may seem like a lot, but then you look at something like Call of Duty: Black Ops and their sales numbers, and you wonder why any developer would ever bother to make a PC game again. CoD:BO probably cost way less to make, and there is no way that they are dealing with piracy on the same scale as Starcraft.
When a game is being pirated on a 1 to 1 scale, meaning for every game sold they are also getting one pirated, that is a serious serious serious issue.