My theory in addition to tax savings, is to influence Florida votes in 2020, and as a platform to bash NYs government
Naw, once he is out of office the Russians have no use for him and would likely put a hit out on him.
He is I am sure butthurt at losing his home state. Now that Florida is his "home" state, he has a chance of winning it.
and for the last time yet to no avail 'cause he's gonna get trounced (for the first time). Remember, he's only won one election.