What matters in this case is the number of units that were available (now sold) - it's likely a small amount on purpose, since selling out fast is great for publicity.

Though unlike Nexus 7, the Nexus 4 pricing is competitive to the US price - the AUD is worth more than the USD and the Australian price is only $50 more (most of which is accounted by the 10% GST tax.)

Australia still has to pay a little more than the US than justified by tax differences, but it's better than the huge price differences it normally has.