I think there are a few other reasons why the tickets are so expensive in Vegas besides the band being greedy and it just being Vegas.
In the last 2/3 years, Caesars Hotel and Casino went through bankruptcy, and just got sold to a new owner/corporation in the last 6 months. Also, I read this odd article earlier this month where the new owner switched from an exclusive contract with AEG, which was Celine's promotion company, to exclusively working with LiveNation. I have a feeling this has something to why all the tickets are so high. I have attached the articles I mentioned below: