When I got to the end of the process to buy tickets, the site never asked for a credit card # for payment. I received a confirmation but it says I don't owe any $.
What tickets were you trying to purchase, the regular or the sorcerer tickets. If it was the sorcerers you could be on the waitlist. Also if you have been to past events your credit card could be on file and can automatically be charged.
Hope this might help,