The cover image for the new Amazon Prime documentary series "LuLaRich" features a woman with her hands raised up as though she is praying or giving praise. The series' subject matter isn't overtly religious, however. It's about leggings. Or, to be more specific, the sale of leggings. "LuLaRich" documents the conception and meteoric rise of LuLaRoe, a direct-sales or multilevel marketing (MLM) company that generated massive profits for its owners and brought many thousands of people, mostly women, onboard to sell colorful leggings and other clothing to women in their own social networks.