You have no clue about our trade and even less about business.
Teachers make more than most tech's. Most are licensed and bonded and as a condition to even getting a license or a job your record has to be clean. Moral turpitude will stop you from getting a license. Look it up. Comparing us to the medical community? $30 aspirin is more than the usual markup we get. The average net profit in our trade for contractors is 2%. Look it up.
We compete against every idiot with a set of gauges and in condition's that would make a hog vomit and a Marine take a step backwards.
You're invited to learn our simple trade and hang your own shingle. Surely you could clean up our dirty profession.