When you say "why did you join this _forum_?", do you mean the whole website? or are you supposed to join a particular forum within the website...
confused...
But if i take your question to mean why do some people join and never return- i can answer that-
I generally don't have the time it takes to learn how to navigate around- not that it's not easy- it's a SUPER site, it's just there's SO much, which is again, SUPER, but i wish i had more time. SO I always end up just going to read stories, b/c i enjoy that and I know how to do it, so i can get to where i want quickly.
...so please let me know if i'm supposed to sign on with a certain forum??... i would choose bdsm library in that case.