As a West Australian I think that there are certain expenses you're overlooking. You'd need access to a car, there are no buses or trains to many of the towns (sometimes the larger mining companies do organise buses or chartered flights). Internet will be slow painfully slow and prohibitively expensive, where $200 worth of hardware and $40 a month (on a one year plan) gets you a whopping 1GB of quota. Food is very expensive, alcohol even more so if you're into that sort of thing. Living in the outback can be very unpleasant depending on where you go.

My roommate is an electrician and has done plenty of fly in fly out work, while the money is (often not always) good, he can't handle more than 6 months at a time since there is often not much to do in small towns.