Who is the “we” in that sentence that should allocate their money to something with a weak or non-existent promise of seeing a return on that money?
The "we" is everyone who wants to build dense, multi-unit housing based on their own assessments of how it will perform, but can't because of single-family zoning laws.
Expensive housing in many areas is a result of laws that keep would-be developers from increasing the supply, fueled by the toxic NIMBY mindset.