I do believe that there is some research that suggests "home town" calls do happen to some degree, and it's ascribed to implicit bias by refs to crowd response. Not to please them necessarily, but that perceived penalty/foul severity and be amplified by crowd noise.
So I buy that Duke benefits from that, and maybe a bit more given the intensity of their crowd.
But, again, I really need to understand how a ref benefits from shaping the outcome of games to favor UNC and Duke. This is basic Human Nature 101 stuff. We all respond to incentives, and the incentives almost always need to be explicit. Are they employed longer? Get paid more? etc.