Anyone should join :) I don't know if we ever hit 10 people at once but basically if you want to hang out and chat with people while you're working or even just to talk and watch other people work just join! I had a blast :D
So I just found out from the main Polycount Hangout thread that you can create an Event on Google+ and have a permanent link to the Hangout! So I tried to set up one for us :D Here are some links! Let me know if you guys can join it or if you have any problems.