Most fancy and "expensive" vehicle companies charge a lot of money to add custom things and teach people how to use them. Turn signals are the most expensive, mostly i never see bmw ownsers don't seem to have/use them. I was an auto parts guy so i might have a different POV... hahaha...
A friend i once had, his dad told us the story of him driving into a neighbors house when he was young and "tipsy".... lol....