Well, you guys obviously knowing much better than me about the back of this web site.
On the other hand….
I used to run a small Chinese comunity long before, which share same topic with spacesimcentral.com. And it’s larger than spacesimcentral.com in amount of post & replies. (But quality is low I have to say)
We don’t have staffs at that time, only moderators who also contribute contents like MODs and Tips. But most contents is contributed by users.
I’m not saying the community is healthy, but it shows that web site run by user generated content is workable (Technically, this web site is mostly UGC’ed too). So you may no need that many staffs you expected.
Of course, it will be a quality issue but I think it could be resolved by appropriate community management. (You have to discover it yourself)
Even you need to post news and keep track updates by yourselfs, it’s just cost few hours every week. (Writing news is not rock science, not in this topic)
And … well, Xoops sucks. Article is difficult to categorize and read, download is not easy to use, only thing that relatively useable is the forum…
Lot of good web application come out those years: Wordpress is good one and not just a blog, and Forum application like VanillaForums, esoTalk, Discourse (SEO may sucks), Flarum (SEO sucks), every each one is far better than PHPBB.
Consider to move to another application if you want to change direction of this website maybe?