"you know very well a bottom end house is around $300K"
Actually you can find properties allot cheaper than that in the cities if you look in the outer-suburbs.
"how can you seriously expect low income earners not to be forced to max themselves out, even on bottom end property?"
If you are only on a bottom end wage, are single, and not willing to sacrifice then honestly too bad - you are destined to rent. Housing should be available for everyone - but that does not mean that everyone can or should own.