Kind of a great point. People definitely build their own secure passes and they're always amusing (compare your boarding pass with LIRR tickets with Ticketmaster tickets; they all do something slightly different and none seem particularly secure).

What's wrong with an image with a unique barcode?

Kids - just bring an Android phone if you’re going to scam, since events can’t require customers to be iPhone owners, and Apple didn’t design this with universal compatibility in mind.