I was only using the car as an example. Nothing to do with costs, just the principle of the thing. To me it is just a result of keeping costs down, and subsequently the paint finish is kept to an ABSOLUTE minimum, quite possibly they only give the metal one finishing coat and no primer, and that is wafer thin, also possibly painted on to metal that is not properly prepared. It all depends what one is prepared to put up with. I know that as I get older, I refuse to put up with inferior stuff and will always return same to the manufacturer/reseller for replacement/repair. As an example, I recently purchased a new plasma TV, it was replaced twice before I decided enough was enough, in the end I got another brand because the original was garbage, ( it was an expensive 1024x1024 102cm unit, supposedly one of the best brands ).
If a product is inferior, it is in your own and every future purchasers best interest to make it known to the manufacturer so that they can, if they want to stay in business, correct the problems. If they are not made aware that there are problems, how can they fix them. It is all about feedback, and the same goes for positive feedback, credit should be given where it is due also.