I think the reason that most users don't "participate" is actually a simple issue, and not necessarily one that can be "fixed." At least in my own case, I don't participate because I don't have much free time and the time I do have is prioritized to reading rather than posting. I often find discussions to which I believe I could make a quality contribution, but I decide against participating because (in my own estimation) the time it would take for me to say what I would want to say is not enough to justify the quality of the contribution I would make. Another way of looking at this situation is that I simply don't invest as much time in using Hubski as other, more "active" users. That is, I am simply a more "casual" user. In this paradigm there isn't really a problem to fix; users are coming to the site from a diversity of life situations, so it is simply impossible that everyone will be participating at a high level. Just my $0.02.