We already have 4 people, not even including you, so I wouldn't really worry about the cost.
Speaking of the cost...if it's 600 bucks one way, let's take a look at what it'll be per head if you join in...let's assume we have 6 right now (me, CC, gR, my buddy Dan, and a guy I know Brad who was glad to help)...that's only 100 bucks a person to stay at a sick hotel, watch a bunch of good bands and have a ton of fun between the times, trade and sell your CDs with forum members, and hang out with everyone IRL. Badass much? 100 bucks is still steep, but if we get 4 more people, we'll be at 60 each. Easy. Save your pennies! If we get 15 people, each will just pay 40. Fucking awesome! Please vote and come!