You can trust your brain... in general. You have to, since your brain controls everything. But there are occasions when your brain will lie to you. Not intentionally, but call it... "miswired" or "misprogrammed". It's been fed some garbage data and it formed some connections that should not have been made.
And scams are basically intentional signals to encourage your brain to form a connection it should NOT have, to reach a decision that will hurt you, usually financially.
Our brain was created to form connections between vast sets of data and memories, and see patterns in every ing: thoughts, ideas, actions, and consequences, even when they make no sense whatsoever. Athletes and gamblers often have lucky tokens or special rituals, because they associated "winning" with those tokens and rituals. We did A, we get result B. That's the power of correlation. But we've been told time and time again "correlation is not causation".
Yet a cult (and by extension, MLM), and scams are very fond of presenting partial facts as a part of their mind modification techniques to increase your devotion to "the cause".
Here are sixteen of the most common cognitive distortions, and how they apply to cult mind modification. (NOTE: This list is long, so it will be continued in the next post).
1) Extreme thinking
Ever heard the expression: "you're either with us or against us"? That's polarized thinking. There are no shades of gray. It's either good, or bad. It's great, or awful. There is no in between. This sort of thinking makes it impossible to discuss things with any rationality, as the real world is full of shades of gray.
Commercial cults often treat anyone who questions their favorite company/product as evil to be either avoided at all costs, or as objects of derision, when all the other side wanted is some honest answers. Commercial cults often throw out terms like "dream-stealers" or "naysayers" and use that to describe anyone who doesn't agree with their narrative, even when those narratives are full of holes. They don't want to deal with ANY questions about their own narrative, either you believe, or you don't.
2) Overgeneralizing
Taking conclusion from one data point, and apply it to everything, is an overgeneralization. Get one "C" on a test, and the student is considered a dismal failure. Get paid once by a suspect scheme, and it must be a "good program". It's obviously not logical, yet you'd be surprised how many people do it.
Commercial cults members are often very fond of citing their own experience in trying out the product as if that validates everything they presented. They can't seem to see that it's just ONE datapoint... their own individual experience, they are are presenting, as if it's the universal truth. Commercial cults are often fond of asking its members to go after the low-hanging fruit first, i.e. friends and family, because those are the easiest to get, thus giving the members a false impression of "how easy it is", thus reaching "overgeneralization". When the members ran out of the easy pickings, they started to find out how the business is REALLY run.
On the other hand, it's more likely for the negative experience to linger and become overgeneralized, i.e. "I failed here, I'll always fail".