I found this while looking at the cheapest houses available for sale in Winnipeg on realtor.ca, someone posted this as a selling point.
That number on the bottom right is the reason a lot of lower middle class people who could otherwise buy a house, get stuck renting, preventing other renters from moving up the ladder. It basically acts as a roadblock. And that profit certainly isn't getting any smaller as the monthly rent gets higher.
This is the house they're renting for $1,100/month,
utilities extra, in Winnipeg's crime infested north end:
As you can see, the slumlord is maximizing their ROI by doing absolutely no maintenance to the building whatsoever. The tenant is likely paying over $1,600 a month in rent and utilities (average household income in this part of Winnipeg is $2,900/month after tax) it doesn't leave much room for food and telecommunications let alone saving up to buy the — hole next door to save yourself $500/month in rent...
And there is a lot of this. Almost every house going for under $200,000 in Thunder Bay isn't marketed as "a great opportunity for a first time buyer", it's pushed as an "investment opportunity" to "expand your portfolio". We're literally treating people's homes like stocks. It's no wonder so many people are homeless and more still are living in substandard housing.