I still go because it's free (for one night, at least) with my grandfathered membership.
And while I can't argue it's the same houses every year, I do have to give credit that the scare talent is improving. Still uneven to be sure, but there were a number of memorable scare actors at the last event I attended. In a strange way, I feel their house scare talent is now on par or sometimes even better than Knott's house scare talent (which I've always found to be wildly uneven). Scare zone talent is still better at Knott's, but SFMM is making headway in this department.