The way fangames like Topaz work is that many people sign up to see if they can download the game that way, and aren't actually interested in posting.

Member retention is quite the important thing for a community, but we gave most of that up when we decided that we weren't Pokerealm. Not an awful thing (we have very few trolls compared to most forums, and we probably actually still get more work done) but community-wise it means that we're a little barren.