Foreman had reinvented himself in his second career. He was sort of a pastor, spokesman and gave the impression he was this big jolly guy.
Once he won the HW championship he had the old fanbase and a new one. He started to do so many commercials and other stuff. He was marketed well and that Grill was sold like what he used to lose weight. Once he found his groove their he profited. Good for him. Until this day you find products with his signature.