The answer is real simple; don’t go to the concerts. It wouldn’t take long before the prices dropped. Springsteen or Streisand is not that great anyway. They may not set the prices, but a non-attended concert or two should lower prices a bit.
It takes a special kind of stupid to pay these ridiculous high ticket prices. No one is forced to go. I can’t feel bad for those who are that stupid but do wonder what their families had to do without in order to buy the tickets.