Why not start setup an aggregator? A site that feeds from all dealer's car sites free of charge and charges them per lead (click or contact). Worries about excessive costs can be restricted with monthly/ weekly or car specific caps. This would put an emphasis on a car dealer creating good branding on their websites and also mean their spend would be directly attributed to the platforms's ability to attract buyers.  Buyers visit the site because it feeds cars in from everywhere in one p