Taxes again.
If you spend a few months in FL, you're already paying sales and property tax there. If you declare FL to be your residence you no longer have to pay the Interest and Dividends tax. If the current legislature succeeds in adding capital gains to the I & D tax, more people will declare FL as their residence.
I have no idea, short of manually cross checking voter registrations how you could determine which homes are "legally" full time residences.
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