With all due respect, I said "many", not "most". Retirees can and will move anywhere, and can and will cite taxation as a motive. Traders can trade from anywhere. And in my area, where people can have a similar time-wise commute to their job (usually in NYC) from multiple states, some can and will cite taxation as a big part of their decision.
Sorry I misquoted you. Many still highly inflates reality imho. And it just happens to be the sunshine state that lures people with some tax incentives. If you had tax breaks in North Dakota I highly doubt retirees would flock from Florida to North Dakota. Retirees are in Florida mainly for different reasons, tax being just one of them but not the most important, at least not for "many" retirees, else the above would hold true. Retirees flock to Florida for climate reasons, and junkies all over the Midwest flock to Florida to get their prescription drug fixes. Spurious correlation I would say.