There are lots of things that cost the same regardless of where you buy them. New cars, flat screen TVs, plane tickets to Thailand (and 6-month winter climbing trips to Thailand), and pretty much everything else besides housing all cost the same everywhere.
With that in mind, your best bet is to find a job in LA/SF/NYC then dig in and find the absolute cheapest way to live while you're there. My personal angle was to take short (3-6 month) contracts in LA and find cheap rooms for rent while there. You can save up a ton of money in a short time, then head back to whatever low cost place you prefer to call home.
So to modify the author's idea, instead of setting up shop in Oz full time, go work in LA for half the year. Using his numbers you'll save the same as you would working an entire year in Australia. Then go back to Australia and spend the other half of the year doing whatever you want.
End result: you spend the same, save the same, and get an extra 6 months off work with which to improve your surfing.
Sorted.