Its expensive, and that is an important reason to share the pain and the glory with team members. With three team members, that's $200-300 a piece per competition, depending on how far you drive and how much meat you cook and so on. I don't know how single person/family teams do it, unless they happen to be good enough to win a lot of prize money, which is getting harder and harder to do.
Our team has probably $500 in costs per competition. We stay pretty close to home, and we are fortunate enough to have a brisket sponsor, Roseda Farms. That saves us a good $120-140 per contest right there. Split the cost among the members and it comes out to a pretty reasonable price for a great weekend! Sometimes we even win a little something, that goes back into the team kitty for future contests.
Brett