Reason is, is that those things have seen their best time and as a final squeeze selling all the techniques that have been used so that everyone can do it..
Maybe I'm wrong, and I would like you to prove me!
Why else would they sell their "serets" and not instead use it themselves silently and make all the money like that... Because once you have a great technique in place that sucks in money then why would you tell the whole world about it that is ready to pay a few bucks for it? And in that way over saturate it for everyone..
Please prove me wrong,