they do use an Australian animal for their company logo.
Maybe that's the big secret of big sales there?
I agree they should give minors more to do in the big picture of things. Maybe allow them to participate more in the naval part of the game, give them more political power, let them spy more, maybe let AI inform where they are going to attack next so you can prep for it, maybe make research within alliances have more synergy so UK shares tech with their leashdogs and they also help out boosting the general Allies tech rate.
Australians kicked the shit out of Italians all around the Med during WW2, here their participation is almost non-existent (well, they landed with 3 divisions in Belgium in my Germany game and defended there for 3 days...). What can you do with 6 leadership and 30 IC... A couple of LCs and maybe a division of INF pestering Italians here or there. Kinda disappointing.
Next addon should look more to add fun for smaller countries which would let this game outlive the "I've played everyone worth playing" moment and give at least as much choice as Vicky2 gives.