so i believe one of the StackExchange founders left full time work at SE to build a start-up directed to here. (http://www.discourse.org/). i I think this was maybe two years ago--no idea about their product.
What I've gleaned from listening to the StackOverflow/StackExchange podcasts is: If you can a build a community, community members will be inclined toward handling a lot of user management as part of their engagement in it.
There's also the implication that if you're not trying to build that sort of community, it's unlikely to be successful.