As a landlord, I can tell you this is false. A good tenant for cheap rent is worth much more than a few extra bucks. Have you owned rental housing before? Didn't think so.
The cute comments ("moar supply") signify your ignorance on the various aspect of the housing market at large. And that is an unproductive comment that demonstrates your overall lack of understanding of the issue at hand.
This "cartel" is a symptom, not a cause. Nobody is price fixing sedans, are they? I wonder why. Oh, supply of hundreds of options and price points? Hmmmm....