I heard that too. But it's wrong, and you should be smart enough to know that. Having sold somewhere on the order of 50-100 vehicles (cars, motorcycles, trucks, boats, airplanes...) in my life, I'll reckon I've got more selling experience than you, and more success at it. I've had people who bought cars from me ask me months/years later if I had anything for sale because they were so happy with what they bought. So apparently I'm not too bad at this.
Customer: "I want to pay $1 for that car"
Customer is not going to get that, unless it's at Steingar Motors where the customer is always right. Hence why Steingar hasn't made a bunch of money selling... anything.
Reality: The customer has rights, but is not always right. Markets work to determine pricing effectively. A good buyer knows a good deal and a good seller knows how to not be taken advantage of. Maybe that's why The Ted has had good success selling things for a profit (or at least break even) and is in a financially decent position.
But keep telling yourself you know more about sales, Michael, just like you tell yourself you own a motorcycle and are good at riding it.