For some reason, the discount system
works well for us. And if someone tries to enter at a discount after
the it is allowed, I just put on the spreadsheet that the rider owes
$25. I've never had an argument at the registration desk. Maybe I'm
lucky....
I find that it did not make much of a difference when we made it early
discount or when we made it late fee. There are always those that try to
sneak by you.