They have tried a bunch of methods like demand based pricing, ID verification, electronic tickets, and lotteries. I suspect these things only work a little and each has its own problem side-effects.

Most venues in NYC seem to use an app called dice for ticket distribution. You can only resell on the app and only at or below the original price. Not foolproof, but seems to work pretty well in nyc, but in a less populated area might be hard if people cant sell the tickets and start complaining.