good point, i mentioned something similar to a friend who is into property. I told him that rental yield cannot cover interests in most situations.
Worse if you max-loan or includes maintenance fees and property taxes.
Then he told me that anyone who bought a private property 5-10 years ago for $1 million or $1.5million would have enjoyed monthly capital gain of $3000 to $5000 or more (respectively), by now. Don't even need to include any rental income.
So it is very scary.