I don't spend much time in the chat room, and scrolling back the history, I get the impression that neither does anyone else.
I think it's a bit unfortunate, because it could probably be a good resource, for example, for discussing closing of question and other moderation like tasks.
Of course, if no one is in the room, then there's little incentive for anyone else to join as well.
I suggest some people make an effort to stick around for a while, to help the chat get some momentum. We could even say something ;)
I'll be around for a while, let me know what you think. :)