After reading this, I don't see any reason why Hayward would choose Utah over Boston:
Then, when you add in Utah's tax rates (not high, not low, no advantages to living here) and his possible endorsement deals in a city like Boston (I'd bet he could get tens of millions a year from Nike alone)....Boston's #1 seed in the East, their #1 pick, their future picks....
Give me one good reason why Hayward would stay?
https://theringer.com/2017-all-nba-team-gordon-hayward-paul-george-lebron-james-harden-5879bd6f7445
Because the Jazz are a better team than Boston.
Because he likes it here.
Because his longest coaching relationship is with Snyder and he likes him.
Because he likes his teammates.
Because his wife wants to stay here.
Because he likes raising a family in Utah. Because he has close friends here.
Because the money is more.
Because he can get more years here.
Because his legacy can be greater by sticking with one team.
Because winning in Utah is more appreciated.
Because winning a championship in Utah is a bigger deal.
Because he is the star and leader in the Jazz like he wanted.
Because the Jazz have a great plan going forward.
Because Jazz have an elite defense and a good offense that can be elite.
Because he has great role models and veterans he looks up to here.
Because he knows what he has here and that he likes it. Other teams are unknown.
Because fans appreciate him here.
Because criticism is much less here than other places.
Because he made it to the all Star team here.
Because it's the better choice.
That's just a quick few off the top of my head.