MLM schemes and affiliate marketing businesses will have, or be related to, underlying businesses of selling products which generate revenue, and they'll have some level of expenses related to producing these products. These are components of an operating cash flow. Businesses, whether private or public, are expected to either have healthy cash flows, or would be expected to grow their cash flows in the future in the case of a startup, to support the share price. Also, shares don't necessarily "entitle people to dividends" as shares often have no dividends. In the case of cryptocurrencies, there is no underlying physical product, nor underlying debt, nor a cash flow generating business.