My US college buddy who lives in a Melbourne suburb pays almost twice as much for a bottle of Yellow Tail there than I do here.
I do not think the country of origin makes much difference in the price of goods in Australia; the cost of doing business in general seems to be much higher. Just seems to be a difference in philosophy in the way folks live. More government services result in needing higher revenues and thus higher costs in most everything.
BTW: He also buys private health insurance to enhance and further ensure his prompt and competent access to specialized medical care.