Nikon fixed this problem by forcing its retailers in the US and Asia to only sell their cameras for a fixed (and higher) price, to bring world prices into line, so in the end, Nikon users in Asia and the US are now forced to pay more.
Not a good thing as it stifles competition.
Canon Australia couldn't give a rats you know what about Aussie users and what they have to pay locally, and if you buy grey, and have a problem they won't warrant anything and if you do send a grey import to them for repair, even though you have to pay for the repair, they stick it on the bottom of the pile just to punish you.
I can't understand why multinational companies like Canon don't have similar pricing worldwide for thier products, taxes and duties excepted of course, but it does show that either the local companies want to make more profit in some areas than others, or countries who buy more get it cheaper.
Personally, I think Canon Australia are just plain greedy, and the margins they give their retailers is pretty poor too.
The best way to get back at them is just to buy grey!
Complain with your wallet, and don't give them any of its content and buy where you get a reasonable price and good service.