I'm not going to criticise anyone who paid £350 for standing, that is their choice. I had the opportunity for Cardiff Night two but passed at those prices.
I've seen Springsteen 3 times this summer, AC/DC, Green Day, Foo Fighters and Taylor Swift. Plus a couple of smaller gigs.
I definitely overpaid for AC/DC and Springsteen at Wembley, £170 each for OK but not great seats.
I don't do two weeks all inclusive in the summer anywhere, I would rather spend the money on going to concerts. That's just my choice.