Earlier quoted context omitted.
People dumping hundreds of millions into the market just to hide it from external forces aren't interested in being landlords.
They don't want to make a few percent on their capital?
If they're getting an absurd percentage increase from property values alone, an extra few percent won't make a difference.
Not everyone min-maxes their capital. Governments probably end up eating them through inflation and taxes in the long run (but in the long run, we're all dead).