Rolled back odometer anyone?

I was a sales manager for a few car dealerships in the 1970 in Vancouver B.C. You could go on any car lot in town and you would find every car had about 10,000 mile per year. There were 2 people that came to the dealerships and spun back the miles as soon as the trades came in. This lasted until one of them decided to return to his home in another country and gave the news media the whole story including the fact that he had reversed the millage on some cars 3 or 4 times. That put a stop to it with many dealers paying fines.