most dealers are there to rip you off, this is why i only buy from alta, he tells me everythign abotu the car i'm about to buy and gives me other options at the same time. as many have said, they try and ruin your cars image so that you sell it for nothign and then they polish it up and ask up to double the money for the same car.
the car dealers in blue area as the biggest jokers, they take a sh*t car and fit all sorts of kabli bits to it to make it top of the line and then they sell it for insane amounts of money. most of the JDM & euro cars in ISB are severely damaged/repaired cars but since the dealers now do such a good job most people think that they got a good deal.
a good example is my ex-vitz. i sold it for 1.5 lacks after it was totalled in a crash and a dealer fixed it up in peshawar and sold it to a friend of mine for over 6 lacks. when i told him what happened he didn't believe me till i showed him pics.
i suggest that if you are selling a cr you should do i t privately and if you wish to buy a car you should buy from someone you can trust. avoid dealers as much as possible as most are thieves.