He turned up at an event that he'd already paid for , having forgotten his ticket, he was then charged an extra £5, it's profiteering, plain and simple, I think a nominal charge should be applied, it's known as goodwill, he is a fan, the lifeblood of any club.
No, its nothing whatsoever like it, a FAN, forgot his ticket, and was then ripped off for a replacement, I see no similarity whatsoever to a parking fine.