I dont know if that is true, the concert and other events adds a bit of value in my eyes, but I think if you really got a feel for the average person in these areas most would prefer the money to be spent on other projects/benefits then making sure a billionaire pays less for a pet project of theirs.
Where are you seeing it is actually worth it? All I could find said "
Because sales taxes have come in higher than projected" which to me indicates less that revenue it is bringing in and more just the general uptick in the economy of the area?