Confidence Men and the Shadow Pyramid
The age-old technique of "con men" is to create "confidence" in some otherwise dumb idea by diversion of thought, bait, or force of personality. The victim gets confidence in a bogus plan, and, in exchange, the con man gets your money. MLMers are very high on confidence.
Since the brain inevitably intrudes itself into the delusion that an MLM could ever work, spirits drop and attitudes go sour. But this depressive state can itself be exploited. As doubts grow when the MLM does not do what recruits were first "con"fidenced to expect, then a further profit can be made keeping the confidence going against all common sense.
Thus, a parallel or "shadow" pyramid of motivational tapes, seminars, and videos emerges. These are a "must for success," and recruits are strong-armed into attending, buying, buying, and buying all the more. This motivational "shadow pyramid" further exploits the flagging recruits as they spiral inexorably into oversaturation and failure. The more they fail, the more "help" they need from those who are "successful" above them.
So, MLMs profit by conning recruits up-front with a "distributorship fee," and then make further illicit money by "confidencing" these hapless victims as they fail via the "sale" of collateral material.