Whats the angle with this so called ecom experts?

I've been watching a lot of content on youtube about Ecom, obviously any one buying any course other than literal 1 on 1 guiding is wasting his money.

But my question is, why someone like davey fogarty who has done over 200million in sales, "wasting" his time on a youtube channel pandering to newbies? I mean isn't his time better spent building the business? Even him, a millionaire, is selling courses.

I look at it as shitty work when you could be building much bigger stuff instead of filming the same starter guide every 2 months. Why would millionaires want to do it?