I think this type of course could be easily sold to people who have absolutely no experience in SEO at all and have potentially never heard of SEO properly before noticing that there is a course on it. Anyone who has even dipped their toes into it would be constantly questioning whats correct and not, a course on this would turn into a bit of a forum, with lots of discussion about whats right and wrong. A tutor doesn't want that, they want to take your cash and have you nod your head politely.
Reminds me of a time I went to a small SEO conference in The Bronx, NY. The whole classed was nothing but how to construct titles, meta tags and keyword density.