This from the last ucif home game. If you pause it at about 12 seconds into it you'll see it packed.
http://vimeo.com/110080009
It's true they had student attendance issues in the past, probably before their Cinderella season, but that seems to have changed.
I also know a few UCF students (unfortunately) who go to the games and have told me that half of the students leave before the game is over, regardless of the score.