Computer used to be for games when I was a kid (online UT / top clan represent! :f ) but that was only because I had no interest in what the other kids were doing - don't get me wrong, I still had cider on the park etc, but I didn't enjoy it.
Now, however, not in any sense of the word - once you have done the 'lets build a linux system' it doesn't get much more geeky so you, well, grow up. To those who are geeks, devote their lives to WoW, and say they're happy with it - I think you're happy (and deluded) because you haven't experienced the world yet. When you grow up (sorry, living your life in a game is not grown up at all) and experience the world you will regret wasting you time with the pixels.
As a hobby, geekism is fine. Not as a lifestyle.