Earlier quoted context omitted.
That doesn't sound like a negotiation.... if you had started at $9,000 and come up $500 at the end you might have gotten it.
But why? It's the same number in the end. Is my willingness to play this type of game worth $500 to the sales person?
You can go through life upset that the world doesn't work the way it "should" - you can even refuse to participate like the original poster. But you will generally have a worse outcome, so is it worth it? Why not play along, just a little?
Same thing goes for: dressing up (why should it matter if I'm in a suit?), sending thank yous (why should it matter if I already said thank you?), and just about any other social grace.