From '80 till now is three decades which means that if prop doubles every ten years the prop value should increase X8, which it has done (as near as I can tell), but the rule of 72 says that is just 7.2% cap gain per year. The average interest being paid on the OPM would be nearly 7% so that chart could never convince me, on it's own, to buy Sydney property.
What about the rental return of 5%approx. which helps with the mortgage and the negative gearing tax benefits. So even if the cost of funds is around 7%pa it might actually only cost you 1-2% per annum to hold it. So that is still 5-6% gain.
Correct me if I have completely misunderstood the concept of property investing please.
Cheers,
Oracle.