Ticket prices for bigger bands have definitely gone way up.
I'm very happy that the genres I listen to are still rather niche and out of the mainstream. The most expensive concert tickets I've ever bought were less than $100, and that was an arena show with two fairly big local bands.
This is strange to me. It seems like a modern change -- is it? Mostly today I see people listening to music while doing something else, or hearing it as background for movies/TV/games/commercials/stores.
In the past, we didn't think it was strange to just listen to a record. That was how we heard music. It wasn't a sign of depression. (Before 2005, the most I ever did to music was drive a car.) Music used to be a more social activity due to technological limitations, but one consequence is that it was more often a primary activity.
I suspect that I have some condition (hidden hearing loss, perhaps), as I can't just listen to music while doing something else. If there's music playing, my brain can't ignore it, or background it. Maybe these people who listen to music in private simply aren't physically able to appreciate it the way most others are. The constant noise of modern life causes anxiety for me, too.
Concerts may be more social but they're also a lot more expensive. Bumbershoot was $10 in 1997, $35 in 2007, and $130 this year. You can't blame teens for choosing to listen to music in private. I don't know how any teens could afford to go to concerts today.