The issue with scalping is it generally doesn't harm the business. To them, a ticket is a ticket and "Oh shucks, sorry you didn't get the one you wanted". Sim

The issue with scalping is it generally doesn't harm the business. To them, a ticket is a ticket and "Oh shucks, sorry you didn't get the one you wanted". Similar to how hoarding goods during a crisis works. So, to answer your question, companies could solve this problem by binding a reservation to an ID. However, there's very little incentive to do that. There's also a slight downside when people show up and say "Oh, forgot my ID". Now you have a fight at the entrance you don't want to deal with.