If you run enough events, I think you can get reimbursed for your badge, or even housing.
Now, is that enough? Depends. For me? No. I DM alot. I wouldn't mind DMing 1 or 2 games for fellow ENWorlders, but beyond that, I'm there to play.
In 2003, I put a sign-up sheet at the ENW booth, and nobody signed up. I didn't really get anything ready last year, and ended up scrapping another pickup game. However this year, I'm already ready.
EDIT: Hey! Wait a minute! We've had this conversation before!!!!
http://www.enworld.org/showthread.php?t=79479