What communities are you part of? What makes it worth the money for you? Why not just use free alternatives like Reddit or FB?
I'd really like to understand this because it's such a foreign concept to me - I don't think anything could convince me to sign up for something like that, yet loads of people do.
Any thoughts?
Something Awful bans a lot of people, quite often. Cash keeps them from simply signing up to get around the ban and acts as fine to remind them to behave and read the rules.
Those aspects make a forum fertile grounds for cultist tribal social bullshit, which often kills the community. It's like setting out fresh baked bread; it will grow mold eventually; but for the period before that it's a lovely wonderful warm comforting thing.