The couldn't underwrite it. I don't know if you've ever researched how to get a true JDM car legal in the states, but it ain't just a trip to the DMV. There is one, and only one company that is legally allowed to import Skylines into the US and I don't think they do it anymore.
As soon as Skyline's make their 25th birthday though, you will see them on every street in America. Lol. 3 more years!!!!!