And the point being made is?
Fares adjust according to availability - as Air NZ reduced capacity, they must have increased the loads in the aircraft.
Also, how many of seats are pre-booked by tour ops who have consolidated ticketing - they will not be paying those fares. Our Japanese friends also have a habit of doing package tours. I remember being the only non Japanese passenger on a 146 from CHC - ROT. They fly into one centre, do the tour of each island and depart elsewhere (e.g. in CHC, out AKL)
As for Ansett.... history, that's all.