I believe that gaming on PC has shifted somewhat, although Piracy plays a hand too. My view:
1) many gamers who would formally have played something like CoD4 have switched to 360 and PS3 - certainly earlier versions of CoD I'm sure would have sold more on PC than console, so we're seeing a switch of focus here
2) A lot of PC gaming now is MMOs and similar genres, so there is less demand for CoD4 on PC than there would have been historically for big FPS
3) Yes, piracy no doubt didn't help - I suspect many more than 2 million PC gamers have and are playing CoD4, but not all paid for the game for sure
4) I think that when a title shifts to 360/PS3 as CoD has, it gets somewhat snubbed by certain PC gamers. I'll be curious, for example, to see what happens with Rage as id really step into consoles for the first time - note Valve seem to be the exception here but I'll be watching their ratio of sales for the next view PC/360 releases to see what happens
So in short, certain titles will sell more on PC but it's no longer a given that big FPS will sell more on that platform. I think just US/UK alone drives a huge swing from PC to console these days for FPS titles.
Heck - I even got CoD4 for PS3 vs PC (first time I didn't favour PC for a big FPS).
Try to be reasonable... its easier than you think...
