Interesting. Thanks to those who have responded so far.
A couple of things jump out at me. Some have mentioned that they don't have the energy, or can't keep up. I've tried the chat rooms on a couple of other sites, and things moved WAY too fast for me. I didn't know who was talking to whom, what they were talking about, and if I had to leave and come back in two minutes, I was toast.
If this has been your experience, try the one here sometime!
The other thing is, I think everybody's waiting for somebody to "be there", but if nobody goes first, there will never be anybody there.
I feel kind of silly sitting in the lounge all by myself sometimes, but sure enough, somebody will drop in eventually.