That is their value to some people. If they price every ticket at the highest price a ticket sold for they will mostly have unsold tickets and will lose a huge amount of money. Venues and artists benefit from full arenas because they make money from selling other things so they already have an incentive not to price tickets too high.
The other thing they could do is use dynamic pricing.
This is completely irrelevant to the discussion because nobody mentioned selling all the tickets for the same price or selling them all at the highest price anyone would be willing to pay.
That is their value to some people. If they price every ticket at the highest price a ticket sold for they will mostly have unsold tickets and will lose a huge amount of money. Venues and artists benefit from full arenas because they make money from selling other things so they already have an incentive not to price tickets too high.
The other thing they could do is use dynamic pricing.
This is completely irrelevant to the discussion because nobody mentioned selling all the tickets for the same price or selling them all at the highest price anyone would be willing to pay.