I know there are a few companies, like Mary Kay and Lia Sophia, who have a generally positive image, but there are many more, often built around some investment scheme, which continue to give this sector a bad image. If you scan the Internet, you will find dozens of negative articles, like "What's Wrong With Multi-Level Marketing?", but very few singing their praises.
The overwhelming majority of MLM participants (most sources estimated to be over 99.25% of all MLM distributors) participate at either an insignificant or nil net profit. Indeed, the largest proportion of participants must operate at a net loss (after expenses are deducted) so that the few individuals in the uppermost level of the MLM pyramid can derive their significant earnings. Said earnings are then emphasized by the MLM company to all other participants to encourage their continued participation at a continuing financial loss.