It's my guess that the percentage of dishonest people in the auto repair profession is no greater than the amount of dishonest people in society in general. I have met only one for sure in all my experience.
I have seen incompetence, mistakes, lack of training and tooling, poor management, and other reasons why people have gotten a poor repair experience.
Our shop does near 10,000 invoices a year. Just how many dissatisfied customers do you expect I should see if we do perfect work?
If you wish to find a profession with dishonest people in it, I would think one would look at a profession where the likelyhood of making money was high to begin with. I would look to medicine, law, financial advisors, insurance agents. Technicians didn't start off to be rich and often money is not one of their buttons.
Bosch Master, ASE Master, L1
33 years MB technician