A well researched and written would earn the author "MILLIONS" and make it to BEST SELLER lists. So there you are. Who can and will pick up the ring. I figure that 50% of the sales would be to vehicle buyers and 50% to CAR DEALERS/SALES PEOPLE. Actually, some in the business are qualified to write this handbook to make the millions. AUTO DEALERSHIP GENERAL MGRS. most likely get their such manual out of the safe for each sales meeting! In my neck of the woods, they are still doing the 20% off one in which the vehicle must be financed through the distributor.
Just my subjective opinion, but give it a rest, will you. Dealers can't be trusted. Who knew? A much more valuable book would contain information on distance-purchasing of cars so that prices would come down as more people started shopping at low-priced volume sellers. Manufacturers ship cars to the dealers that sell them.