wholesale parts will be in the pennies...would seem more costly to have the production line set up to differentiate between those cars with it and those without it!
for example, i have a friend who works for Grants Whiskey in Production. Unit cost per btl is something like 0.12p whilst Malt Whiskey is something ridiculous at 0.27p....by the time you add on marketing, adveritising, tax, retail mark ups we pay of the order of £10-£35 for whiskey.
Similarly Pizza Huts pizzas are about 4p each to make..............
No idea why they would want to make Highline a £50 option other than to give the dealers more mark up... I mean, its not as if £50 is going to make you buy a Golf over a rival priced car is it...you either want it or you don't.