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1. Fuck off we're full
2. Living costs in Australia are so high that if you live in the middle of nowhere what you pay in utilities/gas/tax may see you lose money relative to your income. The people who buy these blocks are a distinct kind of hilbilly, people who go into early retirement and try to live off savings in the middle of nowhere. They aren't employable, social, they need medical care they can't access, they need social support but are antisocial
3. "Australian bush" isn't a forest, it's not vacant land, it's not arrable land.
You're looking at double the price of the land just to get water tanks, power lines etc put in. On or off grid doesn't matter. Your looking at 20k to clear the land of invasive vegetation, you might not even have a viable driveway.
4. Australia is the continent of forest fires. Much of this land is at such extreme fire risk that you're expressly forbidden to build on it. Everything will be destroyed and you will be killed by grass fire if you don't maintain the land and account for fire risk. Fire trucks might not even come, or be able to come. That's just grass fire.
For a full on forest fire your property is straight up charcoal, you may get out alive, you may get cut off by the fire.