At the end of the day its our choice, yes us the punter, if we are happy to pay the money the so be it, to me extra for a girl just because she is mixed or Japanese or Korean or Chinese, or Aussie or any other race is stupid.
Pay for what you like and in my case I like good service anything else is second, including age, size, shape, looks etc.
Some others may have specific things that turn them on and are prepared to pay extra for that!
Good on them go for it pay what you like.
If these girls aren't worth it then they wont last long in the end there are plenty of girls out there you can find anything you want and any size, shape, age, nationality, service, etc the only thing remains is where you want to get it and how much are you prepared to pay
Just find something that suits you and go for it, fortunately not all of us like or want the same thing, that's whats so good about our hobby punting.
Go pay what you like go where you like but most of all go and enjoy.