Sales Managers

Just had a sales manager ask me why we mark up tires. The customer wanted Michelins and requested them by name as part of the car deal. They didn't like the price so they bought generic tires. After the install the customers threw a fit so now they have to buy Michelins and I can't send the others back, nor is there going to be anything on this lot that they will fit. So they are going to lose $900 because they didn't want to spend the extra $200 the first time. Why is it evil for us to want a paycheck? Why are they the only ones allowed to make money?