When they build apartments to increase the density the prices don't go down on the dense units. The builder sets the price and he is his own competition because an appraisal requires just 3 comps. He has 250 comps in his pocket because he built and set their price.

The only thing it does to be anti "NIMBY" is aid in unchecked price hikes on "low cost" high density housing that none of us can afford.