Part of being a moderator is trying to get people interested in whatever you are moderating. If the forum doesn't have anything to talk about, the mod should come up with something.
I don't like mods that never post. Being a mod means being a member too. As a mod, you shouldn't look at yourself any differently or think you are high and mighty just because you are a mod. Being a mod is not easy sometimes, but you have to let people know that you are there to help the board just like they are, and no better or worse than they are. Well maybe sometimes worse.