Matchboy: It's a case of if the dealership are blameless, I want to be able to use them in the future, and be able to press for a good level of discount. Not wanting to burn my bridges with them or jeopardise my ability to push for a large level of discount - I don't want to be more trouble than i'm worth to them as a future customer.
It's also good to level the muck flinging further up the chain, you don't normally get the opportunity. When you get those customer satisfaction surveys after picking up your car, it is all aimed at your dealership experience only. They can penalise the dealership (by restricting bonuses tied to customer satisfaction that contribute to the dealership's bottom line), no such set of systems work for VW UK or VW AG unfortunately. They carry on being crap at the timely supply of cars and the customer has no real outlet to voice their opinion to anyone that can change their ways. I'm sure back at VW AG headquarters they all think they are doing a marvelous job, they never hear they opinions of you or I.
If I was buying via a broker I wouldn't care much who's fault it was or who was paying for the goodwill gesture.