Jamiel

Most of the time that's true. But on the Oneworld fare Fares Rule 3 says "when travel originates in a country for which a specified local currency fare is published and the ticket is sold in another country the fare will be that published for the country of origin. the resultant fare must not be lower than the fare published from the country of sale. NOT APPLICABLE FOR PAYMENTS MADE IN CANADA/USA"

The upshot of that is that as long as you're starting the ticket in Australia,in Canada/USA you could buy an economy Oneworld ticket for up to $CAD1200 less than one commencing in Canada which is a saving of 25-35% depending on the season.
And because the seasons are different you could organise it say using points to come to Australia to buy a low season fare here when you would have needed a high season fare from Canada.
And those savings are just off the published fares. If you bought them through a discount travel agent here you'd get another $CAD100 or so off.
Of course the Oneworld fares require a 7 day advance purchase that you might think is inconvenient but back to the rules - "no advance required for travel originating in the Southwest Pacific".