It wouldn't make sense for a property owner to charge less to rent out an apartment than they are paying to buy it, in the same way it makes no sense to buy high and sell low on the stock market.
You need to cover your costs which includes the mortgage and maintenance fees. In the short term, those fees could be low, but when you need to get the roof or brickwork redone, suddenly you're losing money. Why would you spend money on property only to lose money on it?
Property shouldn't be seen as a commodity, but it also shouldn't be a useless money sink. Who's going to buy anything more than a single-family home if it's just going to suck money out of you forever? There would never be any high-density housing anywhere.