What about shows where the number of people who want to buy tickets is about the same as the number of tickets that are available?

Without scalping, the band sells tickets for $X and nearly everyone who wants to go is able to buy a ticket for $X.

With scalping, the band sells tickets for $X, the scalpers buy a large fraction of them or even all of them for $X each, and then sells them for much more than $X each.

This doesn't let people go who otherwise would not have been able to. It just makes them all pay more to do so.