Great sweeping generalizations.
But that's not what happened, Stamkos took the same offer from Yzerman that he had turned down months prior. He took the meeting with Toronto to call Y's bluff on the take it or leave it offer and then caved because Tampa was a good spot. He admitted to Tavares last pre-season that the reason he didn't sign was because the Leafs were a bottom feeder.
The different tune was a bunch of Lightning fans who called him broken goods when it looked like he might leave before doing a 360 after he came back.
It was never about taxes, unlike hockey fans these guys rarely give a **** about stuff like that, it was about being on a contender in a place that he enjoyed.