I guess that's true. I didn't really consider monthly fees for a course from one person. But then I would say that he/she probably didn't have 400 students in t

I guess that's true. I didn't really consider monthly fees for a course from one person. But then I would say that he/she probably didn't have 400 students in total, but instead 400 subscribed students at all times. Unless each student stayed subscribed for several years, which I find unlikely unless he/she releases new high quality content every week.