I think it's cool to have a meet for 2 reasons,
1- you want to fix a "problem" and want folks to bring some different stuff to try in your system.. see if any of it addresses the issues. (basically, broaden your pool for trial and error testing)
2- Motivation to get something done. e.g. I'd like to have my system in 'x' state before I get a bunch of people over to listen to it. Or, I want to get 'x' project done so I can have a meet to listen and discuss.
You set the tone of your own meet. Are you open to criticism as well as support? If you can handle it, let people know you want their honest opinion... ask them for specifics, not just 'it sounds good'... or ask what they notice standing out... that sort of thing. If your system has lost its direction, these comments are very valuable to bring it back.
I like the analysis. Getting objective feedback is great. But if that's not enough, you also develop a group of friends whose ears you know and come to rely on for the 'acid test'. Even if your tastes vary, you learn how to understand their reaction to see if your tweak matches their reaction.
I enjoy the social aspect of our gatherings now more than the analysis while I was trying to figure it out. It's nice to have a social side in addition to a scientific one.. otherwise we'd all go nuts. I think the NY gang does a great job balancing this and I believe we do as well, we just have less members.
edit...
So far Lately Rich and I are the only hosts I know of.. My meetings will be more about music as time goes on... because that's what I'm into these days. Your meeting may vary.
-C