So, does anybody else do this? Not just for cars, but for other goods/services?
For example, I got my portion of the bill for my surgery in October. It was substantial even with insurance. When I checked in, I almost cancelled it when they told me what my portion would be, but they told me they could cut it by 25% if I called and asked.
So, today I called and asked if there was anything they could do to help me lower the amount. They asked how much I could pay in one lump sum and I decided to go lower than 25%. I gave them a figure that was 33% less. They put me on hold for 5 minutes or so and came back and said that would be fine. My bill would be paid in full.
Of course, now I am kicking myself for not going 50% off, but, hopefully, I still got a better deal than I would have normally. I guess I need reassurance that it was a good deal.
But, moral to the story, negotiate when you can. All you will be told is "no".