Perfectly put. Scamming is a cottage industry. No ethics whatsoever.

What I do is I go to the top guy, tell him I need an expert and nothing else. No experimentation whatsoever on my vehicle etc. I pay slightly extra for the troubles. Before I go for repairs I try to learn as much as possible to know what they will screw up next. If you go in as a layman, then it is fraud and incompetence central all the way.