I still troll them if it's Amway.
With MLM types many years ago, the first thing I would say is to send me a copy of their federal tax returns from the previous five years. Everyone one of them said no. (Obviously). In response I said I wasn't interested at all.
Today, I just tell them that I am not interested at all from the very start. I also immediately say right away that this will never be a topic of discussion again with me. (So far, they have not ever asked me again).