Not so long ago (or, to be perfectly honest, about two decades ago) when you bought concert tickets, you actually got paper tickets with similar graphic artwork as the album the artist was promoting on tour. Now all you get is a pdf file with a barcode.
Here are tickets I found in some bottom drawer. Regardless of the questionable variety of musical styles, the average price of a ticket when I started attending concerts was the equivalent of twenty euros, i.e. the third of what it costs now.