(I'm for relaxing zoning laws but if you ever wanted to convince anyone this kind of argument is like the last approach you should use.)
They didn't quite price in the current zoning restrictions in that they were as changeable then as they are now. If I was particularly motivated and persuasive (or let's be honest good at grift) I could still convince my local city council to rezone my neighborhood to allow said sale. My formulation just doesn't force me to go through a middleman who, most likely, really doesn't care about my neighbor's concerns are just what their cut will be.