Punishing those who stay in the parking lot is the silliest thing I have ever heard (OK, not actually the silliest... but close). These people are one step off of being real fans. They need incentive... not punishment. I think every creative idea to get fans to attend is great... short of force.
Alcohol, naked ladies (nice looking), loud music... oh, nevermind, I was thinking about that bar I was going to open.
We need to keep putting an attraction on the field... yes, the band, cheerleaders and dancers are nice... but we need more winning... that is what gets those bubble fans in the stadium.
I suggest this concept... trick them... they are in semiconscious states... tell them that inside the stadium, we are giving away free alcohol and boudin to everyone who has a ticket, and is wearing red... once they get in, we count their ticket, and they choose to stay or leave once reality sets in. As for pictures, let's digitally rework those pics and crop in some extra people. I just took care of one game... you're next.