@jackwilliambell@stealthisbook@johnquiggin@pluralistic I've figured out that haggling is about relationships. You're not asking for the best price, you're asking "how much do you like me vs how much do I like you". So much of the haggling I hear goes like "just give me any price that you think is fair" and "nono I would never give you a price that won't make you a profit, but you'll make a profit with $X".
The point is to have a repeat customer and to know to go back again. Paying the "full amount" likely means that as a customer, you're not interested in going back.