I had no idea that so many people don't understand what "multi-level marketing" means and its similarity to a pyramid scheme. Cat Driver obviously has no idea what the term means. And there are even some other names for it. Yes, there are some differences, just as there are some similarities. Perhaps,
Wikipedia's definition will help.
I certainly have no objection to you buying Amsoil (or Amway) products from anyone you want to buy from, but I do think consumers should be informed.
If you want to buy Amsoil from Bob and he makes a dime, fine. And does, Jim, who recruited Bob, make a nickel, and does Jerry, who recruited Jim, make a nickel, and on and on. There may be one or two or there may be 10 or 15 "levels" making a profit, not from selling you the product, but for recruiting other salesmen, each of whom tries to recruit additional salesmen. And the end consumer is paying all those people. Without the multi-levels, the product could sell for a lot less. And of course the first ones into the program stand to make a lot of money and the last ones into it make nothing.
And of course there's no similarity between "multi-level marketing" and the route that products take from producer to consumer as in Cat Driver's examples.