Translation: I drive old cars for a variety of reasons and one of those reasons is because I don't want to spend any money on the upkeep. Move on, not worth your time. Certainly don't work for free or a discount to prove a point. That customer doesn't value his vehicle, your time and is never going to be a source of future income. Believe me when I tell you that people that actually value your time, book appointments with you constantly, pay your price and a hefty tip typically don't send much business your way, it's not coming for someone you had to convince to let you do the work at a discount.