I am a sucker for punishment! Just keep swinging that bat.
I will try to give the counter argument to my insanity theory (just to prove I have been listening to you lot and aren't just here to be nasty):
1) There is an ownership premium that means rent remains below (sometimes well below) equivalent property prices in well located areas.
2) Therefore house prices can rise separate to rent for quite a long period of time because the markets are somewhat separate. i.e. people will pay a premium to buy in a particular area that renters won't pay. Call it "social status of owning in X suburb" if you like.
3) This ownership premium can grow. Where does the money come from for it to grow you might ask? A well located suburb might have people in the top 20% of incomes living in it when the population of the city is 1M people. As the city population grows to 2M people the population living in that area might now have the top 10% of incomes living in it (same number of people - they are just a different group of people - i.e. those with more money).
Ok, I guess that's one way of looking at it.
4) So if you believed this then yield doesn't matter. You buy in at a crap yield and sell at an even worse yield because the ownership premium has risen.
In your own personal example in Taringa, and in the example I just posted of inner Melbourne, I am arguing NOT to sell the property at all. In these examples, the property values have increased dramatically AND the absolute dollar values of the rents have increased too (even if in % terms the yield it is still low based on the current property value).
So, if you buy and time really well, very soon (and much, much sooner than you may think) you CAN get a positively geared scenario.
GSJ