The reason is because as soon as you enter their "turf", you are dead. They will suck the life out of you for hours, playing every game in the book and employing every little trick until they wear you down. And they will wear you down, They will give just enough to keep you there, but not enough to give you their best deal.Why not? Because they will waste your time. Plain and simple.Do it by e-mail, fax or phone, but never set foot in the dealership until it is time to pick up your car.