Speak to -
1 Aus government re Luxury car tax, import duties GST etc etc
2 Nissan Aus - low volumes, high infrastructure setup costs due to the low volumes sold.
Its not simply GTR s that are expensive relative to the USA, it is all cars sold here. And the higher the initial cost the higher all the taxes will be.
Just look at the price of a commodore sold in the states.
Aus wages are also much higher relative to the US so affordabilitry is mch better too.