My friend Julie tried MK - but she quit after two long hard years. She had to put lots of money up front for the sample products set up. And so she was stuck selling the samples (in the end) at a discount price. Plus, it helps if you have tons of friends willing to have those parties at their house. She didn't. I've met 1 or 2 ladies who were quite successful with MK but they were very aggressive & totally unwilling to take "not interested" as an answer...from any one.
Oh & Body Shop is exactly the same type of business structure. They expect you to give several parties a month, every month with no excuses, or else they get medievel on you!