Your forum, being a more focused demographic, really has an opportunity to take off.
Lack of focus, while absolutely essential for a service like Frih, is also its downfall. Because it has to be broad-spectrum, it doesn't pull together any common themes amongst its user base, really. That means that generating user interest is a lot harder. In a focused forum like yours, the users have a built in reason for interacting, and it brings them together and incites passion. Here, users have to cast out ideas and hope that someone latches on; it's a lot harder to generate momentum.
That said, because Frih is a business model, rather than an interest-based community, it has to be broad-spectrum, else many who come for hosting won't be interested, at all, in the forum. Unfortunately, appealing to everyone generally means not really appealing to anyone in a lot of cases.
If I may ask a question - how do you keep spambots away? What specific phpBB plug-ins / countermeasures do you have installed in your forum? Care to recommend any?
I'm currently setting up a small forum myself and all I have for a countermeasure is a 'human Q&A' field (with about 3-5 preset questions at the moment). Will that suffice?