I reckon its historic - euro cars were a real premium back in the late 80's and 90's - they were rare and expensive based on demand/supply. And our small market size meant it was expensive to bring them here and support (service etc) ...
things have really changed now but the euro dealers are still holding prices high - the taxes (e.g. luxury / import etc) are still there .. but prices are way beyond that excuse now ...therefore dealers are enjoying massive margins and competition has not been strong enough to warrant them pegging prices back .... I'm hoping this would change but doubt it over the next 3-5 years.... beyond that everyone will want euro car and prices should drop back hopefully ...
The US enjoy low pricing because its a volume market and its highly competitive market ...they are lucky ..then again they shat their pants during GFC and we didnt