As Belle De Jour (
www.belledejour-uk.blogspot.com or
Secret Diary of a London Call Girl) once said.. a whore isn't paid to arrive, they're paid to leave. Or something like that.
Thats definately true with the 'high class' working girls; their expense comes mainly from the fact that they are needed to shut up to the tabloids. The 500$ whore is more than likely working through an agency, and this thus 'safer' than the 50$ whore or street walkers.
But then again, I'm not sure about how this prostitution thing works in Australia, somehow I understand more about the English system.
I'm not English and I've never been to England btw. LOL.