Even if you get a dealer to SHOW you more for it you are not really getting more.
There is big difference (most of the time) in what you think you got and what the actual cash value is on your car.
If there is room in the car you are buying then they can show you more money for yours.

I love when people go around quoting KBB.
Last I checked they werent in the buisness of buying or selling cars.
You can email them and see if they will give you the amount it says your cars worth.