The kind of person that has the personality to earn a lot of money would not likely give away something that didn't benefit them in any way. Rich people are usually the worst tippers and the stingiest of people... and yeah I know a lot of wealthy people personally.
But very few poor people tip in Porsches.
The guy probably owns the only Porsche repair shop within a hundred miles and goes around giving out Porsches knowing that they will spend more time in his shop than with the owners.
Cast your bread upon the waters and the Porschses will return ten fold.