To make money, silly!
Haven't you caught on yet?
The course will just contain all the same stuff like the "loci" the "link and peg" and mnemonics BUT they will also give you a Memory Supercharger and say that "...even if you already have this tape the coaching session will make it worth your while...", or something like that. Then you will get a typed letter through your door with fake highlighter all over it from Pete and what's more, you will be told that if you respond within 21 days you will get an X amount reduction so you order straight away thinking you are getting a great deal. Not a bad business - repackage tapes eveyone has with a coaching session and a "playbook".
Cynical?
True!
Does that answer your question?