Note that a lot of the financial benefit described here comes from living somewhere remote -- in particular the housing and food costs. That's the reason for the strenuous warning not to live in "Sidney, Melbourne or any major Australian city." From a larger perspective, it partly accounts for choosing Australia over America (low population density --> low housing costs, etc.).

For a full analysis, the cost differentials of living in the Australian outback vs. an American city (or whatever) have to be decomposed into price level, consumption, and other factors. For example, I pay a very high cost for living in New York. But I recover part of the cost in various benefits. Broadly: 1) New York may be the only place in the world where my employment situation is possible, 2) New York is a social coordination point where it is especially easy to meet the kind of people I would like to meet.

This is probably the case for many people who decide to live in New York.