There isn't much sense of community here other than the few who have gone out of their way to collaborate (hi DM60
)) or have been around for ages and accumulated knowledge about the other members that way....
So I'm thinking the answer boils down to a combination of time/progress and unwelcoming community. On today's internet, without a good community a forum is doomed to close shop. There's just too many other options out there for people to feel like they need to filter through the negativity.