Kerry did something very similar with his yacht. Everyone does this kind of stuff, especially politicians. Not that it makes it right. If there was ever a 'real and authentic' audit done of all the people working in government, over half of them would go to jail. But they know, like I know, that it will never happen.
Having lived in New York for a couple of years, I can speak from experience that everyone in that city does whatever they can possibly do to avoid the outrageous New York, and NYC, taxes.
I am not saying it is right, I am only pointing out that it is very much, extremely common. That's why my wife would shop in only in Jersey.