These books have sold millions of copies. Right now millions of people worldwide are online, many of them trying to peddle something or other. These people are ticked off that that isn't happening. Marketing is the world's best game. The better you get at this game, the more glittering prizes you get.
Marketers can get rich.
Other people merely have jobs. Successful marketers are winners, to a person. The thrill of winning keeps you young, vibrant, energized. Marketers have the satisfaction of knowing that they're helping people, lots of people. Most of the world does little if anything to transform lives and make them better.