"Toyota sells more cars than Chrysler with fewer than one-third of the number of franchises. (The average Toyota dealer sold 1,589 vehicles in 2008; the average Chrysler dealer sold 124.)"

There's your answer. The dealer selling 1589 vehicles will *want* a larger showroom and a large demo fleet to draw customers. They'll happily spend a million $ to upgrade his service dept and showroom to impress customers. The brand gains a "bigger, better, brighter" association and the manufacturer has vested interest in helping the dealer succeed. Whereas Chrysler has to work with 12 dealers to achieve the same sales. Those dealers won't be queuing up to upgrade their showrooms and (for example) may struggle if Chrysler develops a new engine whose diagnostic computer costs $150K