TCI: Cost of Living

I will now ask an unanswerable question; however, reasonable guesstimate responses are welcome.
How much would be the yearly cost for two adults to live on Grand Turk? We would like TV, internet, 2-3 bottles of wine per week, to eat out once a week, and to own and maintain a vehicle (golf cart?).
And while i am asking unanswerable questions, after the initial buy-in, how do the expenses of living on Grand Turk compare to those of living on Provo?
Thank you.

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