One has to assume Einhorn has done lots of research on multi-level marketing. And he knows the real deal. Herbalife’s customers are the distributors. Corporate doesn’t care much if the products get to a real customer after that. They’ve already made their sale and collected their money.
Multi-level marketing has very little to do with selling the product, and relies almost exclusively on continual recruitment of new distributors. But the product is important to make the MLMs not look like pure pyramid schemes.