They have a slew of stay-at-home associates mixed in with some ready to excel entrepreneurs on their team.  Meaning?  They have the products that everyone needs and wants, as well as those entrepreneurs to sell it!  Anyone who is a follower of the MLM world knows you have to have a practical product, so people buying it know what they are going to use it for and how to use it. doTERRA has found the fine balance needed to succeed.

This “outlier” experience helped him to develop and grow both his own brands and increase the value of his brand partners as he was quickly becoming an influential professional skateboarder. By leveraging his influence and designing new concepts and ideas, he helped turn a rising footwear and apparel brand into a $500 million international company. He used that same expertise to build skate brands later in his career launching the world's first true professional skateboarding league Street League Skateboarding and a first of its kind skateboarding channel, ETN.
Marketing is part industry-driven and part creative thinking. In the case of network marketing, it is also about finding salespeople with charisma. When you hire people who are excited about your business and product, they will share that enthusiasm with others. An enthusiastic sales force leads to more sales, but also to more recruits into your marketing network. 
If you insist on trying one of these MLM offers, the least you can do is look for proper business registration with BBB, toll free number, and proper address (no Post Office box). Also, you will need lots of family and friends to make it work. As a final step, check the MLM materials for one or more of these "red flags" that are associated with the worst of the offerings:

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