Daniel Andrews addressed this specifically in his press conference yesterday. Although people want to see fines for rule breaking, the information those invlved in the clusters can provide to health authorities is far more valuable to the community than the fines, or the sense of justice that comes with punishment.
It just makes the next outbreak harder to contain because people are afraid of the financial penalties and are not truthful, or don't come forward at all.
I can understand where your both coming from and it does seem hypocritical that other people have paid fines, but i'm not sure that any fines have been handed out retrospectively - they've all been people caught in the act of breaking the rules. Not 100% sure on this last point, so happy to be corrected, but that's my reading of the situation.
BTW - 21 is a fantastic number for VIC.