Actually it's the cheapest promotion that received this kind of feedback, ever. Their alternative was to use some leftover scrap for the test. The only cost was

Actually it's the cheapest promotion that received this kind of feedback, ever. Their alternative was to use some leftover scrap for the test. The only cost was the car itself - and if Tesla/SpaceX manages to catch it in the future, it's definitely going to be the most expensive car ever.