I also had no problem registering Friday. The only problem was that the only entrance we were allowed in for pre-regs with a badge was on the opposite side of the convention. But there certainly were not more than 12 people or so waiting to register when I got there.
Also, I don't have a problem with at-con registration. If by the con I didn't feel that my costume was finished enough or if something went wrong with something else and I couldn't make it or got sick, I would have felt bad for pre-registering. I've heard you can cancel your pre-registration, but I think the at con registrati