All landlords are housing scalpers. That's all they are. Making private profit money off a finite resource that other people, normally the most vulnerable classes of people, need to survive.

If people want to invest in owning property, buy industrial and commercial land. Nobody needs a warehouse or an office building to live. They need houses to live.

But residential landlords won't do that because managing an industrial commercial property means you're dealing with a business, people with negotiating power, knowledge of law and rights, and the ability to enforce them, which is too hard. Landlords only want to exploit poorer, (financially and time-wise) people.