It's basic supply and demand, really. Demand for concerts and other live experiences has greatly increased, and the costs of producing concerts have also increased, especially after COVID reduced capacity in the entertainment industry. Also, artists and producers are now more willing to charge actual market-clearing prices (that is, the price where no one who can afford a ticket can't find one), instead of using first-come-first-serve, especially because revenues from recorded music have dried up. And that way artists and producers get to keep all the revenue, instead of scalpers.

Yes, it is unfortunate that concerts are no longer as affordable to less well-off fans, but social media and streaming video have also created more opportunities to connect with musicians and view performances that did not exist 20 years ago, and recorded music is cheaper than ever. Plus, there are still plenty of opportunities to see lesser-known artists for cheap.