Surely it's not that hard to figure out?
NZ has a minuscule aviation employment market and yet every third person born grows up wanting to be a pilot. There is a ridiculous over supply but we just can't help ourselves.
And so in order to feed the addiction there must be close to 200,000 or maybe more NZ pilots working overseas. The company I work for in Asia employs from all over the world and yet kiwis have always made up a steady 20% of the pilot group.
I'm not saying that is necessarily right and NZ is potentially losing out on broadening the depth of experience in the industry but it is understandable. Many lament the brain-drain of NZers leaving for better opportunities. Opening the flood gates to the swathe of pilot applications from non-nationals would no doubt help accelerate that drain (with pilots have some of the largest student loan balances owed to the NZ Government).
But if you can crack it goodonya!