A guy came into the shop one day for a repair on his very expensive hot water pressure washer. The parts were only going to be about $30. The labor was going to be about $200. He declined and made a scene, all about being able to buy the parts on the internet for half that price and repair it himself.
A month later, he came back with busted hoses, sooted up burner and coil and a few other things. Didn’t even ask for a quote. Charged him close to $700. because of all the problems he caused with his expert repairs.
He didn’t think I remembered his tantrum. I told him he wasn’t paying for expensive parts but for the knowledge of how to do it properly. He just wrote the check. Became a pretty good customer.