The first thing I thought of after reading it was New Zealand GA which doesn't have these issues.
What New Zealand has is the topography and tourist appeal to support these services, all contained in an area the size of Victoria. It's not really comparable.
GA the world over is static or in decline.
Thirty years ago, my mates and I drove around Australia. We stopped and did some joy flights at places such as Wilpena Pound, The Witsundays, Kakadu, Kununurra, Rottnest Island and a few others. There were only one or two operators to chose from at each of those places, not 5 or 10 (if GA was in it's heyday and declining ever since). I imagine there's still only 1 or 2 to choose from now.