The more cars on the road, the more willing to get cheap spare parts on them, so there will always be those who want to meet this demand. The trouble is that they will try to satisfy it by criminal means and at your expense... that is, at the expense of your car. Long ago, when many of my readers were still watching cartoons, carjacking was commonplace. Often, cars were stolen for resale in another region with broken numbers, or sold to you, just by calling in a couple of days and offering to return them for a fee...