My guess is that the majority of subscibers to this website are not either dealer principals or sales managers. As far as wholesalers needing to make money too, I would think that there are not too many dealerships that condone moonlighting by their technicians even if it isn't for one of the dealer's customers.
And yes, I know that manufacturers have National Accounts, but typically there is something in it for the dealer, like a ship in commission and parts and service business. That is assuming that the manufacturer is ethical and actually lets the dealer know that they have shipped trucks into their territory.