Just for fun I dug out an old ticket stub from a Dire Straits concert at Red Rocks from 9/4/1985. $14.30. Taking inflation into account that ticket would be $42.
Think I'll buy a BR and enjoy in my HT. Chair is more comfortable. Beer is much cheaper. Line for the bathroom is much shorter, and I can pause while taking care of business. Can control volume and don't have to stand for the whole concert.
At the same time I can't blame Swift, or any act, to charge what they can. That's the (not-so) free market at work.