Brodie, here's an example for you. Vespa, was trained by Tim Vince before going to Australia. Off memory won 3 races here around 25k in stakes or thereabouts, low key races. Since going to west Australia, has won total of 12 races and 160k.
This horse has managed to race against lesser competition for good stake money.
We are not necessarily disagreeing regarding your initial point just it's fairly obvious, they have a plethora of races almost every day for all classes. And as gamma rightly pointed out have conditions better suited to be able to race your horse more without the same strain you would have here, I.e. stands, grass, very large fields etc etc.