I used to while married, but not anymore. I was damned good at it, too - I had been accused of being one of the writers of several shows with comments of "You're testing out the next season's material on us, aren't you??"
I hardly read it unless I know the writer personally - just like P'Gell, poor grammar, spelling, syntax, etc gives me migraines. I was directed to (what I'm told is) is a fabulous "Secretary" fanfic, but the fact that the author(s) used present-tense narration made me see red at the edges of my vision within the first run-on paragraph. No, just ... no. >_<