I like to help people for free! Thats make me to start a general forum and providing free support over there! What makes you to do so?
I start a forum when I feel that I could give more to that niche and when I have a interest in the subject of the forum. I'm not one of those people who randomly opens a forum for no reason
I started a forum for fun and to expand our knowledge on most subjects we can. I like to have very fine, short and informative content on the forum.
I love the niches and think I have something to say. Then again buying a script and starting a community is something I can do very fast, so it really doesn't help with my compulsive 'admining'
I started my forum to create a niche that I was very interested and believed I would have many interesting discussions with. I started my forum to discuss topics that I love.