That's definitely a positive.
Have they sold out general admission before? I figured they'd cram as much SRO into there as possible and was surprised to see it sold out. It must be a safety thing. I'm sure a lot of people would go just to say they went and have a chance to storm the field, even if they can't see much of the game itself.
Wikipedia shows last night's attendance at 3,099 at #1, followed by 3,075 against UCF, and 3,033 against WVU two years ago.