If you registered using a debit card, BE SURE TO CHECK YOUR DAILY SPENDING LIMITS!
As a safety measure, most banks have a daily spending limits on their debit cards. Charges submitted that are over that limit are automatically declined, no matter how much money you've got in the bank. So check your account! If your card is declined for any reason, you'll lose the tickets you were awarded and have to wait for another chance to get tickets in the secondary sale, or purchase after-market tickets - don't let it happen to you!
If you're not sure of the daily limit, or if your limit is lower than the potential purchase total for your Burning Man tickets, contact your bank. If necessary, they should be able to make the necessary exception on your account (if you're awarded tickets, the transaction could happen anytime between January 23 and February 1).