That's common for all forum startups. It takes incredible amount of time and work to run a well behaved and respectable forum. It takes the same huge amount of time to grow a forum. And when you have 50-100 members, it is NOT fun work. Have you ever asked why only few forums make it and so many forums get closed down? Patience. People get fed up, people quit, people sell out because most are not used to hard daily work and think that popularity and awareness comes from nothing.
That's why whoever the owner of this forum was in the very early stages of HD life, he managed to buy out small but promising startup forums.
I remember one time when I had some kid complaining to me daily over MSN that his 17-member forum doesn't grow and how everything is bad. Well, success doesn't come overnight, you have to work for it. I've been mentoring the poor guy for good 5 months by giving advice, making corrections, after which he shut down his forum. Too much work, he said.
Best,