mrquackers wont like this but I've gone for the last three years.
Last year a friend who owns a pc store added me and a few others as employees of his "company". We plan on doing the same this year.
Year before a friend who did some work for Gamespy let me have his pass as my own. So that was somewhat legit being that he's from Canada and couldn't go.
Year before that I borrowed someone elses pass and hoped not to get id'd by a door guard. Name didn't match my appearance if you know what I mean
Yeah, it does get pretty crowded and looking around about 40% of the people you see makes you wonder if they belong there.