It's all to do with overheads, if rent is high, or mortgage, and you have lots of staff to answer calls and do background work, then your costs are a lot higher than a girl who rents an apartment for $300 per week and works on her own.
Langtrees does attract the lookers for sure, also a lot of girls who flit from state to state and they can lay their heads there whilst still being available pretty much 24/7. They can get the bigger bucks. They have the highest overheads in WA by a fair bit I would guess.
Anyone charging over $100 for 30 mins....should....be registered for GST so the first 1/11th of your money is going to the ATO. As of July 1 all companies paying PAYG need to be reporting that directly to the ATO as it's paid which makes cashies a lot harder as they have an ongoing record, which is the whole point.
Your average AMP almost certainly, IMHO, declares a sub $75k revenue so no GST. They also take mainly cash so no PAYG paid. They also pay some tax......or maybe not, who knows.
A private operator can probably make a reasonable living after costs. Depends whether they need to show an income for supporting a home loan etc. They may also be claiming benefits so only want to work in cash.
With the cash-less society taking over slowly, their ability to spend more than $600 - $800 pw will become tricky as sooner or later someone from the ATO is going to ask how you can afford the goodies you have. Not a problem if you live for today and blow it today, more of an issue for someone working for a future outside the industry.
The other issue is the business mentality of your average Chinese operator vs a let's say Aussie run business. One invests money to make money, one doesn't. Strange when you consider Western investing is supposed to be seen as short term, and Chinese as very long term.