I'm not quite sure what point OP is making 🤔
I went to see Stevie Nicks last month, tickets weren't cheap (weren't £400 each either), paid for flights to London, 3 nights in Kensington hotel plus food and drinks, train fares etc.
Last year bought VIP tickets to see Hollywood vampires in Birmingham, again flights,hotel, train fares, food and drink.
Lost count how many times I saw David Bowie live in concert.
I've worked since I was a teenager, rarely go out socially (other than to music gigs), haven't had a holiday since before covid, drive an old Peugeot.
Who has the right to judge how other people spend their money?
Each to their own