Did you know that by appending a page for a game on Steam with a code such as ?cc=au or ?cc=us you can see what other countries are paying for the same game?
Did you know that often Australia and New Zealand pay $20-30 USD more for AAA titles, even for a digital download, with the same content?

Let's rise up and fight for fair pricing!
Note: This is an issue caused by the publishers, not Valve or Steam. Valve does not set the prices.