You are ducking the question by picking holes in my specific example (which might have been poorly chosen), so I'll phrase it in the abstract.

Consider any low skill job which serves rich customers. Under what conditions should we pass a law restricting supply, making an unlucky subset of those workers unemployed but raising wages for the remainder? All commodity services (including, but not limited to landscaping, taxis and maid service)?

Should we only do it in cases where we already do it? (I.e., should we simply maintain the status quo?)