Sounds like you needed to charge more. :)

You wouldn't necessarily want to set the standard price significantly higher, since at some point you'll trip a large number of people's thresholds for "too much for a hat". However, you could leave the price and queue system in place as it currently stands, and introduce a higher "queue-jumping" price. Effectively, that would make the slot a coupon, but the concept of a queue seems much more appealing (especially to a gamer audience).