Agreed. I have walked out of.many sales.
Years ago, I wanted to buy a particulat new car. I was still in college, and was going to finance. Knowing that most of the deprdciation comes as you drive the new car off the lot, I was not interested in losing money on that. So, I told the dealer how much I was willing to pay, total, and how much for the monthly payment. The dealer kept coming up with other numbers, so I left. Later, the dealer called me, and claimed to have gotten down to my numbers. I stopped by. They had lied, on the phone. We continued this for about 2 weeks, until the dealer got down to my numbers, on the last day of the month. Then, I used a lot of deals that were available (GM loyalty, GMAC earnings, manufacturer incentives, and a $1,000 rebate) to drop the price by another $10K.
I drove that car as a full-time courier for 14 months, and racked up some miles. It got side-swiped on the highway by an inattentive teactor-trailer driver, who pushed me into the left guardrail. I made the repairs myself. I also backed into a low concrete pillar, putying a mark on the rear bumper.
Then I sold that car, for $3K more than I paid for it, and lived out of the country for a year.