You know up until last year i used to think the same thing about Australia and its prices compared to similar products in the USA. The fundamental issue here is demand, which obviously derives from population. Consider the USA has close to 330 Million people (yes I'm including illegals) AUS has just on 21 Million. Of that population difference, if 10% of the US population buy a snowboard thats 33 Million sales, if we sell to 10% its 2 Million, so I'm sure you see the difference in price markups, sell less = more profit margin, sell more = less margin.
A prime example is this. Australia has a massive and excellent quality wine industry, so why when i travel the the US, why do i see the exact same bottle of red that costs $30 here in AUS cost $8 in the US. Simple the US bulk buys our wine, and i mean in the high millions of bottles, whereas the Australian consumer market cannot even use the amount of wine that the US buys in one order.
Another massive factor is taxes, GDP (per capita), demand, and country geographical location. Basically the government decides what to tax and how to tax it to a point where it is still considered by the population to be worth paying the price it is listed.
There are so many factors to pricing that goes beyond the obvious that it sometimes makes no sense, and trust me I'm not defending this, i hate that shit here is more expensive but unfortunately thats how it is!
my names's Petey and i have gigantic balls