Bludger, if people only thought about 'houses' as 'yield only feasible' investments, you'd probably find most houses wouldn't even hit the 7 figure mark today. But clearly they do.
You are only coming from the point of view of a 'predominately yield only' investor, but bear in mind that there are many capital growth investors (me included) within the 'total property investment population'. However, most people are owner-occupiers so to them, why would yield be as important as it is to you? Also, number crunchers like yourself often fail to price intangible features as well. Let me give you a few examples:
1. How do you value lifestyle, living close to parks, shopping strips, top private schools, streetscape etc.?
2. How do you value time? (time saved to get to work, less travel time wasted so you can spend more time with family and leisure because you supposedly live close to the CBD, or close to amenities and transport)
3. How do you value ego? (i.e. by saying you live in a premium suburb like Toorak or Brighton and the feeling of inviting guests to your 'Toorak' house)
4. How do you value the thought of living near other successful people
5. How do you value living amongst the rich history of particular suburbs and the nostalgic feel?
People obviously value these features differently, hence why we have successful and unsuccessful bidders at auctions because they value the holistic aspects differently.
You may also ask, why on Earth would someone pay $2 or $3mil for a house? Well, besides the fact that they could, is that this house is probably one of the only 'massive' purchases made by a couple in their lifetime. Hence, why would it be 'unreasonable' to pay that sort of amount, when you can enjoy it for 30-40 years? Not everyone invests in property (or shares, or whatever investment vehicle there is). Some people simply just work, and live in a nice multi-million $ house.
Anyways, houses in premium suburbs have generally had sh*t yields for decades, so if your argument held, these places would have been overpriced w.r.t yield decades ago, but clearly people still buy them and a correction has not reverted these houses back to your 'number crunching methods'.
All I can say, good luck to you if you find anything within 15kms with a reasonable yield (whatever that is to you), but I am pretty sure that with your thinking, you would probably end up doing nothing, and still complain about this dilemma in the next 5, 10, 15, 20 years.