I was a car salesman at a dealership for all of...um...I don't think I quite made it a month.
Anyways, all they want to do is get you in the dealership, so they can sell you a new car. That's all there is to it.
When we were trying to sell our van semi-quickly before coming to Australia, I had a dealer respond to my craigslist ad. I figured...what the hell, I'll go in. I knew what some were being listed for on Craigslist, and what I'd take if someone made the offer. I made sure they made the first offer and...it was downright fair. Extremely fair considering it was a dealer buying it, and not private party. I thought they'd offer half price, or something crazy. Of course, I never dealt with the guy who responded to the ad, because he was most likely a new car salesman, and expecting to get a new car sale out of the deal.