100% agree with this comment. When you're buying a even a brand new car, the manufacturer doesn't make any money off that sale because they've already made the money selling to the dealership network for them to then sell cars to you. Classic cars, with the exception of situations like Jaguar Classic or Porsche Heritage which is owned directly by the OEM, are used goods and completely removed from making money for the corporation that made them.
Car merch is entirely consoomer, and while I can understand someone wanting some level of related stuff if they're particularly passionate about their cars (Lord knows I am), buying the ///M badged polyester coats and baseball caps made in China is just pure cringe. It's like going out wearing a football shirt.