Because money.

The truth is, the AUS population isn't going to be large enough to justify the expense. Setting up servers is incredibly expensive, and doing so in AUS is probably even more so due to it's location and the general price of pretty much everything there.

It's simply not a big enough market, so no, you don't deserve anything. If they do any other new servers/data centers it's more likely to be a West Coast US one.

And let's not even talk about how a lot of the latency problems probably stem more from the poor infrastructure in Australia than anything else.