That's great, but half the current US Team are from NZ, not just Coutts, and Ellison's billions are a blip compared to the Treasury.
NZ has been the mother-lode for international competitive sailing personnel and not only crew (designers, Management, etc) for many years. Most of the successful racing teams today are richly stocked with NZ sailing talent. In addition much of the component development comes from NZ. Oracle's AC72 rig was designed and built in NZ. Luna Rossa's whole AC72 was built in Auckland from plans produced by ETNZ . The America's Cup is more alive in NZ than it is in the USA.
The other countries that you mention are not seriously into sailing and probably won't sponsor a national team. The US won't, heck they're too busy funding wars. If it weren't for Ellison, the USA probably wouldn't be in the Cup now. I wonder if Obama or Kerry even know it's on. It's not about having the money - it's about wanting to spend it on sailing.
The fact that NZ government is prepared to put considerable amounts of tax payer's money on the line speaks volumes for the sailing psyche in this country. If you attend a boat show in Auckland you're almost certain to run into the Prime Minister wandering around, taking in the products, talking to vendors.
If NZ provokes national sponsorship, they will lose their best talent.
ETNZ has received government sponsorship for decades, certainly since I have been living in NZ they have. The sailing talent that were in this just for the money have already all gone. So far in the AC34, there seems to be enough talent remaining in NZ.