I would have some doubts about this because the LDS members who go on missions are predominantly male and from what I'm aware of, those members involved in MLM

I would have some doubts about this because the LDS members who go on missions are predominantly male and from what I'm aware of, those members involved in MLM are predominantly female. There has been a large increase in the number of female members serving missions since a few years ago though, but has MLM already been popular since before that? These are verifiable things though, if you have the data. There is a large amount of male returned missionaries who do stints at a handful of companies (e.g. some solar one) who do door-to-door sales though, and can leverage their former experience.