It's the phenomenon known as pulling the ladder up. Where once upon a time owning a home was affordable for everyone if they made sacrifices, we entered an era where those who bought multiple properties when it only took a few years of savings and hard work now recognise the benefit of it and will probably die with reasonable wealth. But to do that they've been quite happy to create a situation where their grandkids are probably going to have to work for 20 to 30 years to afford a small basic home. It began under Howard. Back when he was in the PM job house prices were getting pushed up and it's pretty much been steadily inflating prices since because that's pretty much all the liberal party knows to keep the economy rising. One of their schemes was to give people from overseas free citizenship of they bought houses here (at least that was the case a few years back, not sure about now) and that pushed the average prices above a million. But a lot of people think it'll keep rising forever. If the ass drops out of the market as I expect it will, plenty of people are going to be paying 20 to 30 year loans on property that won't ever be worth what they paid for it. And I think there's a level of delusion and desperation for the prices to keep rising.
@Natboy the issue with saying that 300k combined income earners is around average is just plain wrong. Might be a decent portion earning those incomes. But they're high on an income pyramid where we include a CEO earning billion dollar bonuses to calculate that average. Still seems to be more homes I know of where a couple both work for under 80k a year combined and the job market has meant that it's hard to find even that kind of income with casualisation of jobs.