The problem is that some people don’t know when to say no. The last time I had my Toyota into the dealer, a women came in and had a stuck caliper on a rear wheel. They told her that she would have to replace the caliper, pads and rotors on that wheel and while they were at it, they should replace the calipers, rotors, pads and bearings on all wheels, “because if it happened on one wheel it will probably happen on the others”. Then they went on to tell her that the stuck caliper would most likely has been dragging and the tire wheel diameter was “likely” smaller and she should replace all tires as a safety concern. And, they not only sold her four new tires, but they told her she needed five new tires. The cost was almost $5k! When the service manager left I told her it seemed excessive.
She politely told me to mind my own business, which I usually have a hard time doing!