PC games do get pirated a lot more than their console counterparts. That's a fact, not a "claim". For example, look at
these figures back from 2009 (article is in German language but the TorrentFreak charts are self-explanatory). As we can see the ratio of PC torrents vs X360 torrents is approximately 3:1 (if you compare the numbers for CoD: MW2 and Prototype). With Street Fighters IV it's "only" about 2:1 but I think that's because a fighting game simply works much better on a console so it seems only natural that the interest level of PC pirates was lower.
OK, sure. Feel free to make all sorts of wild claims about how these numbers are inaccurate or how they have been pulled out of someone's ass and then feel free to come up with much better and more accurate statistics if you can.
I know that one potential weakness of these numbers is that it's only torrents and that no other sources were included. It's only a potential weakness though since I am very much convinced that if you were able to track usenet and file hosting services that the number of pirated PC games would only explode even further.
Anyway, I am, of course, not claiming that these numbers are
the one and only universal truth but they do very clearly indicate a
trend. A trend that has nothing to do with claims or pissing off Sony (BTW if anyone is wondering: the reason the PS3 is not included in those charts is that PS3 piracy did not exist in 2009) or Microsoft or any other weird conspiracy theories but a trend that has everything to do with reality.
Finally, on a personal note, I find it very unfortunate that there are fellow PC gamers who are constantly trying to downplay the very real piracy problem. Everything would be much easier for us PC gamers if we would stand united against piracy instead of wasting energy on making up excuses for the thieving assholes out there.