If the people are willing to pay whatever then why not? Inflation could also be a factor.
If the question were when did u2 become greedy i think the answer might be somewhere in the last 20 years, around the same time they sold their souls.
There will always be people willing to pay "whatever" but that IMO should not mean you start charging more and more.
Especially in a cost of living crisis.
The people who will usually pay "whatever" are mostly the most loyal/committed fans - so by upping prices you are exploiting your most loyal and committed fans.
I'll probably never give u2 another penny - and that of course is my choice and of course u2 won't miss it - but for something like the Zooropa vinyl I could have maybe been tempted - but at £60 they can just fuck off - greedy bastards.
The hoodie lark at £80 when for example The Cure are selling theirs at £40.
It is pure greed and it is IMO sad to see.