Your dealership must be different than all the others I have ever heard of. Incentives are given from the banks for loans, extended warranties, accessories, vehicle manufactures. There is very little money for the dealership or salesman in a cash only dealing if there was no deanship would sell under invoice and there are many that make killing doing just that.I work at a Chevy dealership so I know how it works. When a guy walks in our dealership with cash or cashier's check he gets hooked up.