I agree entirely with the comments made by others here. It makes a lot more sense for anyone in the "Lower 48" (or Canada) to sell the automatic car and buy a manual one, since there is a readily available market in which to do so.
However, considering that the originator of this topic appears to be in Puerto Rico, the distance factor needs to be considered as well. I don't know what the NSX market is like there; it must be very small, since there are no Acura dealers on the island, and the cost of shipping a car to the mainland to sell and another back to the island might be considerable. So there are additional factors to be considered in determining the best decision for this particular owner's circumstances.