I did for about twenty five years, then I just stopped. There was a lot of self esteem issues I had to get through, as well some relationship stuff, it kinda took my GMing down to nothing. Then school, my daughter, and being a full time dad (a 24/7 job). I just haven't gotten the interest back (never liked doing it anyways).
Presently I am working on a couple of GURPs 4e campaigns, but I am not sure where they are going.