[User8712]

How? A scanner proves the ticket is valid and unused. After all, that's the purpose of a ticket. How does the selfie ticket achieve this? Who cares whether or not you match the person in the photo? It doesn't verify anything.

This is as secure as a printed piece of paper that simply says, You're welcome to John's BBQ. Confirmation number A2M1.

Anyone could print off that paper, or make up a random confirmation number, and they can do the same with the selfie ticket. Unless it's scanned, there's no security. It's fine for your $5 bake sale event, or backyard party for your neighbors. It's just a way to customize your ticket with a personal photo. The person checking the ticket isn't going to care if you match this photo, they'll just glance at the screen to see if it has the event name and looks somewhat official.