they probably dont want to do it to keep the playing field level its proven where some of the top ps3 and xbox gamers played with pc players and got pwned because a keyboard and a mouse is alot more precise the people who dont have the money or dont wanna use them would be at a disadvantage if everone uses a controller is alot more fair
source THIS IS FOR XBOX BUT ITS THE SAME PROBLEM DONT HATE ZOMG ITS XBOX NOT PS3
According to Sood's sources, "many many months ago," Microsoft set out on a Xbox Live project that would let PC and console users interact on some form of united multiplayer platform – a grand idea on paper. In practice however, it's said that PC gamers "destroyed" console players every time.
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The slaughter was so bad, Sood says that Microsoft even pitted "mediocre" PC gamers against "the best" console gamers in testing, and the results were unchanged: the keyboard and mouse prevailed. It's not clear what titles were played, but Unreal and Gears of War are mentioned.