This is an awful idea for the reasons you listed, but also for the fact that you'd only have a chance to get a ticket for shows that will sell out. You would be

This is an awful idea for the reasons you listed, but also for the fact that you'd only have a chance to get a ticket for shows that will sell out. You would be unable to plan in advance and would likely waste hours in a queue. Why not just require a name for each ticket and check ID at entry?