But it would be much more interesting to actually see the books. I'd bet a lot of money that the tenants in expensive neighbourhoods are much more likely to pay on time, every month, and to leave when the contract is up. And in addition, the labor in dealing with each tenant is paid for out of $2000 not $200 rent, so more is left for the owner.
In other news, payday loans in sketchy parts of town come with higher interest rates than 20%-down home loans in good neighbourhoods. Does anyone think this is because payday loansharks are uniquely greedy human beings? They are just operating a very different business with different costs.