Eh, it was halfway my fault. It was basically because a series of long, complicated events - in the end I ended up moving the forum and when we moved we lost all posts (it was on a free forum, we could not get a backup) and about 90% of our users. He ended up shutting it down.
It frustrated me, though, that was before I knew promotion sites existed and I only advertised through the few other forums I went on. He was also very inactive, I did virtually everything on my own..