How is anyone making money from courses if dabeaz isn't? He's got the word of mouth going on, celebrity status in the Python world, world-class courses, it does

How is anyone making money from courses if dabeaz isn't? He's got the word of mouth going on, celebrity status in the Python world, world-class courses, it doesn't make sense to me. I'm not asking rhetorically, am truly curious about what's going on.