This is (mostly) how the Australian immigration system works. It's a point system which is weighted towards the young, healthy and skilled. People with certain in-demand professions (eg doctors) can get in relatively easily.
Perhaps, but isn't Australia generally very racist? That would definitely be something that would hamper immigration.
Not generally no. There is certainly some racism in Australia and some areas that you'd roughly compare to parts of the American "Deep South" in terms of backward attitudes, but overall Australians are pretty tolerant.