Setting up separate accounts for every ticket purchase seems like a LOT of overhead (especially scalpers buying many tickets at once and piecemealing them out),

Setting up separate accounts for every ticket purchase seems like a LOT of overhead (especially scalpers buying many tickets at once and piecemealing them out), and is easy to defeat, e.g. require out of band auth via the phone number associated with the account before logging in for the first time on a new device.