The median price comparison over time (it probably is just above inflation) is flawed when using that to assess your own portfolio. Why? Because the median property shifts. 50 years ago the median property might have been 10km from the CBD, 30 years ago, 20km. Now, 30km. This is normal as the city grows in size and population, and changes in income distribution.
So say Sydney median prices grow at 1 or 2% above inflation. Does that mean a given property will also grow by that much? No. Because a given property doesn't move while the median does.
Sure any property has to be 'affordable'. But affordable to WHOM? A house 10km from the city might have been purchased by a working class family 50 years ago. So at THAT point, that property has to be affordable to them. 20 years ago, that 10km from the CBD house would be considered an mid-ring suburb and only affordable to say a white collar higher income earner. It's not affordable to a low income person, but because of the growth of outer suburbs that ARE affordable to low income earners, that 10km from the CBD house CAN be more expensive.
Today, that would be an exclusive, right next to the city house. It hasn't moved: the city has grown around it. So today it's one of a very small number (relative to all the dwellings in the city) of inner city houses that is totally out of reach for any ordinary person. Is that a problem? Not really, since the number of very high income earners has increased (but still very small relative to the population) as the population increased.
In short, the 'prices have to track wages' argument is incorrect because the 'price' it's talking about is not specific to any property over time. It'll keep shifting, while our properties won't.
Alex