Only starting from this year. According to Q-dance Australia the black stage wasn't full enough when they didn't have an international playing (bullshit) and when they do have internationals it's the same djs that come every year. Tha Playah and EA were over in December for another party and Decipher is booked as an international.
The smaller scale parties in Sydney are bringing the more wanted djs and Q-dance are just using the same names over and over. It will be interesting to see what happens with defqon after this year - I sold tickets every year for them and refused once I saw this announcement and from what I can tell the sales aren't as strong as other years. Defqon Australia has an edm stage, and not a dedicated hardcore stage. Go figure.