The problem is that you are not taking advantage of previously unrented space, such as a spare room would be. You are forcing people that live in the city out so you can rent their room.
That's the "part-time labor" section of my post is about. And, at its current level of detail, your criticism could be applied any time someone finds a more economically value use for something and "forces out" (i.e., out bids) the previous buyer.
