Fame is a marketing channel. The best money comes if it's a marketing channel for a service that you sell. This has always been the case and is why movie stars

Fame is a marketing channel. The best money comes if it's a marketing channel for a service that you sell. This has always been the case and is why movie stars become producers, why music stars start labels, and why sports stars start promotion companies and clothing lines. In other words: fame is a means to an end, not an end.