I don't know that this has ever been the case.
What has always been the case though is that there is always a percentage of people who fudge their figures to get a loan that they really can't afford.
Check out this article on what NAB were promoting as affordable lending in 2009. http://www.news.com.au/money/proper...o-beat-rate-rise/story-e6frfmd0-1225791082144
Based on an income of $61,000, a deposit of $55,000, and a good savings record, NAB offered a loan of "at least $450,000".
"You could bid on a property at auction this weekend knowing that is the least we will lend you," a mortgage adviser at NAB's Surry Hills branch said.
He said the loan amount could be even greater once the buyer went through the official application process, when some "human discretion" could be applied.
So at current interest rates of around 6% (assuming a good discount), an interest only loan on $450k would equate to $27,000 per annum, well over half of their after tax income. Thats before they have paid rates, insurance, repairs or even principal on the loan. When banks were pedalling 7+ times income loans in 2009, it is little wonder that their customers are now struggling to repay them.
Lets do my exercise of what happens when interest rates correct to historical norms... at 9% interest, the interest alone takes almost all of their after tax income!!