Not sure if he means "at 6:30" or "by 6:30". But either way, if your card is declined you're almost certainly going to lose your place in the line/GA, particularly so if it's "at 6:30".
I know of another fan that was offering his GA tickets for Vancouver, and he also said that he had problems with his credit card, so he added the clause that the person claiming the tickets should pick them up at 6:30 pm.
Sounded like he nailed it to me, but it takes a native to judge and they can be quite fussy about the pronunciation. I wouldn't be surprised if Guy made was in earshot for that.
I wonder if it's a worldwide contest or just North America.
