“The vast majority of MLMs [multi-level marketing companies like Amway and Ambit] are recruiting MLMs, in which participants must recruit aggressively to profit. Based on available data from the companies themselves, the loss rate for recruiting MLMs is approximately 99.9%; i.e., 99.9% of participants lose money after subtracting all expenses, including purchases from the company.”[64] (By comparison, skeptic Brian Dunning points out that “only 97.14% of Las Vegas gamblers lose money …. .”[65])
(Wikipedia, “Multi-level marketing”)

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