every dealership has multiple profit centers... new cars, used cars, service, parts, body shop, business office.... each one has some autonomy but needs to have a symbiotic relationship to be successful.
usually we are each others best customers... but with that comes some things that makes the relationship hostile... like when a customer wants a rush pick up on a used car, so we force a safety next day when the shop is scheduling regular customers for two weeks down the road...
but yeah, just saying the sales department should eat the cost is sometimes tougher than it seems.