Hey man! Don’t know if you remember me or not but we used to talk a bit back on CS and BF. I was also a moderator on CS (My name back there was WhatEvilLurks) and I’m still friends with John (Gossy) who created the sites back when KnowPost went down… I see him at least every couple of months and talk to him online a lot.
Basically, people got bored of CS, myself and Gossy included.
A couple of other question sites went down, particularly one which was centred around teens and chatting, more than actual meaningful discussion and exchange of information, and we were inundated with inane crap. That drove off a lot of people, some others got busy with life and work (Gossy included), the quality of content went right down, and really John was just fed up of paying the hosting costs so he axed it.