Key mistakes new forum owners make
I think the key reason so many forums fail in the first few months is lack of dedication. The admin thinks he just has to create a forum and then suddenly all the users will pour in. But the truth is it takes a really long time for a site to find a good place in its community and even the search engines. And so you see the admin give up on the forum real quick become he underestimated the hard work and the time it'll take to make the forum popular in its niche.