Hi i think that one of the most hard to build community/forum is a computer help forum: people sign in, post their computer problems, read the solutions and then disappear for some weeks/months (usually without saying "thank you").. what is the right thing to do ? advertise more ? add some different arguments completely Off Topic ? pat on the shoulder needed...
Thats the nature of the beast I'm afraid.I would have the comp probs as part of a wider ranging forum....still computer related as that seems to be your area of expertise. /pats techdo on the shoulder.
Set a posting quota before someone could get an answer to his/her problem. Drastic yet I think that will keep them on the board. LOL