Presumably the ticket is tied to the purchaser's id in some way (picture, name, or payment info) and at the event ticket holders need to present such informatio

Presumably the ticket is tied to the purchaser's id in some way (picture, name, or payment info) and at the event ticket holders need to present such information. It'd be a trade-off against people who can't make it to the event being out of luck (no way to resell), but stopping more of the scalper's bad behavior. You could alleviate the trade-off by tying the ticket to a second factor like a CC that you could entrust to a friend for the event, or allowing more refunds before a certain date.