But it isn't like for like... the kiwi's are having a great special. Airlines put their seats on sales at different times, its a free market. If Qantas dropped its price to match (or come close to) Air New Zealand's sale, what happens next week if United releases even cheaper seats? Should Qantas drop its price again?
Qantas is pricing its product based on its supply v demand system. I'm a Qantas fan too, I check out there prices and if they are too expensive on the day, I do what I would do with any other purchase and check elsewhere.
So because a vendor has offered a product for a certain price, I'm not allowed to go to said vendor and ask "I want to use you guys, but I don't like the price, can you do better"? That's pretty much the basis behind negotiation. If they say no, I'll reevaluate my position, if they say yes, then I'm better off. Besides, after speaking with a QF rep on FB, it sounds like they are wanting to see if they can do a better deal for us, and if that is the case and I like what they offer, then I will chose to fly with them.
Keep in mind that half the reason why this forum exists is to discuss methods for stretching the travel dollar further.
On your final point, it respectfully makes zero sense. Essentially Qantas Int is losing money, but since you are loyal, they should lower their price (and hence make less money than selling the seats at the price they are advertising). That only works is Qantas does not sell the seats and based on loads to the USA, they do! Qantas is a business, the business should charge as much as the market is willing to pay. If they are charging too much, people won't buy the tickets and then they will need to correct the price.
It make perfect sense. How much profit do you make on a sale of $0? If your business makes no sales, then you will not be in business for very long.
Yes AirNZ are having a sale on right now, that said prior to their sale, their airfares was still $4,000 cheaper than QF. In fact, by letting QF know about my feelings on the issue rather than simply going straight to AirNZ, I've effectively given them a free-be.
Yes I'm under no illusion that my contact with QF means anything more to them than feedback from customer #62326, but in my experience of running a business, feedback about when you only just missed the mark was more valuable than when everything was peachy.