iD software has historically produced Linux versions of their games; I remember fondly playing the quake(s), and doom 3 under Linux.
While there have been lots and lots of reports over the years showing there is a Linux gaming market, it isn't a large enough market share for these game developers to put serious effort into it. I bet some of them actually see developing for Linux as a hindrance, even though most big game dev companies essentially abstract-out the bits between PS3, XBOX, Wii, PC, etc that are different.