It's amusing to see that there's the expectation of a participation "prize". Yay. You showed up, what an exceptional effort you made! Here's your prize!
A $20 (or more) entry fee and multiple hours of driving, sometimes with a hotel stay overnight and a weekend spent, to participate in an organized play event ... yeah, the least they could do is give people a slice of card stock.
[edit] Magic players often get booster packs for participating in tournaments, I might add. It's not a strange thing for competitive games.
Edited by Danthrax