With contractors at least you could make the argument that there&#x27;s safety at stake if they don&#x27;t know what they&#x27;re doing (e.g. your cabinets fall on you).<p>I totally agree about realtors though. It&#x27;s such a tautology - they&#x27;re &quot;necessary&quot; because they have access to private information, but that information could just as easily be public if the system worked a little differently.