And dealers of the same brand in a given market have different business models. Some seek to maximize profits on each transaction without regard to how it may affect retention. Others sell cars at little or no profit just to say they are the biggest.
Trade ins are often like snow flakes. Cars of the same general description often have dramatically different values. Credit issues are also common. As is the ability to provide structure to a deal. Dealers who fight for the highest trade in value and the best possible approval put the customer and themselves in a better position.
Successful dealers know how to satisfy customers, work the car, the trade, the structure and the finance approval. They sell service and parts in away that builds profits and loyalty. The system is Darwinian. There is no pricing system that will ever exist that will obviate the need to have these abilities.