The basic premise behind The Secret is not at all improbable- and does work very well. Yes, perhaps in a placebo effect for sure, but like many a self help therapy, that really doesn't matter, as long as those that need to improve their lives find a set of tools that work. For some it is meditation, others NLP and TFT tapping. Is there a scientific basis? Quite probably not, but far better the world is full of people thinking positive things, and believing they will break their cycles, than walking round in a grey depression for the rest of their lives- because I tell you that does work.
On the whole, positive thinking people have more friends, are generally happier and lead a lot less stressful existence. Happy people do attract opportunities to them- that is a given. After all, would you rather sit in the bar with the cheery and jovial, or the miserable and depressive? If you were to employ a member of staff, would you choose the one who believes in himself and embraces the challenge with gusto and positivity, or the one who's given up before they've even started?
The Secret, however. Where to start?
Yes, it is a money making scam of the highest order- a glossy respin of a document that is long out of copyright and in the public domain for free. Branding and marketing mean that gullible people are being relieved of whopping great wads of cash that they need not spend, and that is a shameful indictment of these PD gurus getting wealthy through other peoples' misfortune.
The premise though, in its FREE and unmarketed principle is a worthwhile philosophy, and I have no problem with any who take it and run with it for themselves.