AbsentMindedNumpty - I'll bet you anything you like that your friends never made an overall net-profit out of 'Amway.'
I can put you in direct contact with my good friend Bruce Craig (the former Attorney General of Wisconsin), who once seized the audited tax-records of every single 'successful' Ambot in his state. Many of these Ambots had gone on 'Amway' cruises.
Out of 20 thousands 'successful' Wisconsin Ambots, not one had made an overall net-profit and paid income tax. At that time in Wisconsin, the top one percent of the 'Amway' pyramid, were declaring an annual net-loss of one thousand dollars on average to the IRS, but this didn't take into account their wasted time and effort.
When UK regulators investigated 'Amway' in 2007, they discovered the essentially identical situation with approximately 35 thousands de facto 'Amway' slaves, but at least one millions UK citizens were churned through the 'Amway income opportunity' fairy story 1973-2006.
Just as in 'FLP,' the real cash has been made in 'Amway' via related advanced fee frauds, in which adherents have been peddled a step by step plan to achieve a form of paradise on Earth.