It is because her fan base is so young, they can charge that amount.
I have a friend who has a daughter who is a HUGE Taylor Swift fan. The Phoenix concert is close to her birthday, and all she wants is to go to this concert, so she and some friends are going.
Dad, who makes a ton of money, is paying for it - an 8 hour drive, two hotel rooms, five tickets to the show, food, etc. The total for the trip is in the $4,000 range.
I was incredulous. “How,” I asked, “can you do this?”
His answer - “I can afford to, plus, what the hell can you buy a 15 year old, short of a car, for her birthday? I’m getting off cheap.”
The iPhone X would’ve been cheaper than that