Some buyers do not care if they hire a low baller. Some buyers have learned their lesson and know it takes a reasonable amount of money to complete the work.
People have to learn that is OK not to "win" the bid and that reputation matters.
Yes, education does matter but not for the general laborer. While I pay my laborers more than the DOL stated average I am not going to say that I pay them as well as I would like. No matter how you slice it labor is the largest single expense in this business and is about 40% depending on your overhead and your other labor burden allocations.