What was the biggest MLM scam ever and why?
All the original travel agent cardmills are a three way tie - TravelMax, NuConcepts in Travel, and World Class Network. They all pitched travel agent tutorials and agent 'credentials', all ended up whacked by various regulatory agencies ( FTC, Attorney Generals, etc ). One CEO has a permanent injunction, another was sued for 13 million dollars and spend the next five years in Mexico, all of them tried to do other deals afterwards.