"But I suppose manpower for customer support cost too much? " No, I don't think so Carl. What I believe is too many kits "missing" just a certain set of wheels, engine or other parts popular for kitbashing. I understand back in the day a lot of pro street kits somehow , , ,
left the factorys "missing" their big rear tires.
Stuff like that is what happened to "customer support" , not legitimate claims.