I wouldn't be surprised if several of the people who've posted a little, then stopped, left because they perceived a hostile atmosphere. It's less hostile here than the late rec.climbing, where it was common for regulars to flame newbie posters just for being newbies.
But even in spray, if there's a lot of posters filling the world with their presence, to quote Fanon, it's reasonable to assume that it's just not worth it to join in.