That does not make sense from a game-theoretic standpoint. You would be helping other landlords at your own expense. It would be better to let other landlords make that sacrifice and rent our your own properties for as much as you can get.
that's the thing. They are okay with helping other landlords because they themselves hold other multiple properties. There is more benefits by having the rates high than losing money on a few units.
It totally makes sense for the rental property owners.