A dealer will always give you the "Schwacke Wert" A guide price for all dealers that buy secon hand cars. That price enables them to add on 2000 EUR throw the car onto the forcourt and sell it so someone again.
If you are buying a new car the you should barter with them. Dealers don't earn much on a new car anyway, but where they do earn their cash is with your custom for servicing the vehicle.
If they won't give you the price you want, then go an look elsewhere. Most Dealers can't afford to let you leave the premises w/o satisfying you.
You could always try and sell it privately, then you will get more for the car. But NEVER pay the price written on the price tag !!!
And yes, a car will loose up to 40% of its value in the first year. that is why alot of people buy so called "Jahreswagen" Most employees from car firms get huge reductions on the cars they make, and can afford to sell them after 9-12 months. Even with a profit.
Ford offers it, Audi do in Neckarsulm and Ingolstadt VW in Golfsburg ( Car park on a Suturday )
Alot of DC workers offer their cars in the local papers ...
I run mine to the ground...