Jamie Oliver is a successful chef and restaurant owner. Why should he sell cook books if he makes enough money?
You can't judge peoples motives purely on how much money you think they make. If you do it probably says more about yourself then the person you are judging.
Maybe he's passionate about teaching? Maybe he wants to network and meet people as well as trade?
Secondly, its only £60 a month or whatever. He's only going to make money from that business if people keep re subscribing on a monthly basis. Meaning he has to provide a service that people value. Scammers try to take large one off payments because they know their days are numbered.
I actually used his service for a few months. Did I make money blindly copying his trades? NO! - Did it inspire me to new ways of thinking and open up new ideas to me YES!