I wouldnt go crazy about it.. NZ is too small as population and i wont expect to get many traffic for it. even if it was a .co.nz.
my suggestion to all those who trade domains, look at population of country first and then invest, the more population, the more traffic.
I have dozens of single letter of .co.nz even with PR of 6, guess what sort of traffic they get, nothing over 50 unique a day.