RHD in the states or a LHD in NZ are just plain dangerous in traffic. Unless you have a passenger, pulling out to pass is "hit and miss" in my book.

Apart from the "novelity" factor, why on earth would you want a RHD in the states?

Given that as you say, specific RHD parts are hard to find.

Would people assume that a JDM FairladyZ or a export HS30 are worth the same?

It's not for me, it's someone else that's looking for it. He likes the idea of having a car that's authentic to the way it was in it's home country. I agree - it's more of a hassle having a RHD car in a country where we drive on the right.