There is a difference of scale but there is also a difference of life, car 7\10 years & reducing, helicopter our 500 was built in 1974 so there is a lot more bights at the cherry + we have to spend & in the main with the manufacturer, where as the automotive Co. have after market Co like flees.
Forgot Robos only last how long before you are into big re build.
If some on can answer H500 question regarding PMA pitch link question (other than greed) why was it ok & now it is not