It's like this..
Hayward wants to win
His wife wants the Miami lifestyle
He's not going to win in Miami, and the nightlife in Utah is a joke (just ask Matt Barnes)
So the logical compromise is Boston. Hayward gets his best chance to win and while Boston is not Miami his wife gets to live in a "See and be seen" kind of city.
It's Boston.
He'll be making enough money to take trips to Miami, Hawaii, PR, DR, and any other nice weather place she wants to visit.
They are used to the weather in Utah, Boston is nothing.
Miami isn't better than Toronto, Milwaukee, Wiz, Cavs or Celtics.