Secondcurve, I think an accusation of stealing is a bit harsh. If that was the intent, I do not think it would have been posted here. It was an honest question from someone looking into whether there is a legal, honest way to accomplish a goal.
I'll now admit, I have a biased view in the same direction. I also have a daughter who is a senior in high school who may be attending UNH next year. I pay real estate taxes in NH and have for many years. Given that real estate taxes are the overwhelming portion of the NH revenue system, the one that funds the university, why shouldn't I be allowed to use that system? FWIW, I would make the same argument about a NH resident who works in MA and wants to send their child to UMass.
Also, FWIW, this is the UNH policy on this. I looked into it last week. I didn't like it, but accepted that this is the way it is and moved on. The short version is that your residency is established for all 4 years upon your original acceptance. Full text at the link below.
http://www.gradschool.unh.edu/home/residency.html