Habit and Zero Punctuation.
Also, occasionally, it's fun to engage in conversation, what with this and other forums kind of being the only intellectual stimulation I get nowadays. Which is sad, I'll admit, but I don't do much reading anymore and gaming/other forms of media consumption/work kind of fill up all my time.
Most of you folks are all right and it's entertaining to read banter. Even the lot I disagree with on a regular basis.
No matter how douchey ya get. I love ya.
I don't doubt that there'd be a lot of fun people to hang out with here...just so long as we avoid an "ism" or whatever conversation in person. Though I'm all but certain those sorts of talking points would bear out quite a bit differently in a real life situation.
Occasional breaks help, to be sure, but I keep coming back.