Probably about 50 active. No worry about inbreeding as familiarity gives rise to as much exasperation as it does understanding. Some people I was dealing with ten years ago on a different site I am still today. And has not become any easier as many of them with age have only become more strident and opinionated.
It's quality, not quantity that matters. Kind of like sex. Not that I think of this site as sex but... Ohhh goodness! I should have stopped while I was ahead. ;) :D!