This is what I'm curious about. Are the networking opportunities really that good? Or is it mostly just idiots who won't shut up about how amazing their new idea / site / project is, and how it's going to be the next biggest thing? Because I can get that all day on Skype if I want, and at least with Skype I have a handy "hang up" button, and can make up excuses that don't exist like, "sorry, cleaning lady is here, so I have to go". I can't do that if the guy is 2 feet away from me though.
Are these people worth knowing, and people who become contacts for years to come? Logic dictates probably not, because the people worth knowing have their own bloody offices, or even buildings, not renting a chair and desk for $300/month.
Maybe I'm wrong though.