A typical reason that any person would decide not to stay at a forum is simply that he/she feels that it's hard to get into a group since everybody seems to know everybody where as the new guy/girl knows nobody. Getting across past that is the hardest part for new people at a forum.
At least thats how i feel atm. But then, its part of being new, and hopefully I too can find someone inhere to talk to

Oh... And i joined the forum because i was tired of not knowing anyone to whom i could talk to about bondage and bdsm... Which gets kinda annoying quite fast.