You should ask this instead: would you steal money from others or not with the risk of losing money yourself? and you need to realize one thing, do you want to earn money without working and without knowing where that money came from? I don't care if it's a MLM business or pyramid scheme/scam you must make sure what are you going to feed your family with, whether some people losing in order for you to earn or not.
Karma is terrible, if you do such a thing you can be sure that at some point things are going to turn bad, scammers scam that is what they do, if you know that you are investing in something that is a scam at some point you are going to miss and you are going to get scammed too.
Yes. Money must be earned honestly, otherwise you can lose everything and even something more valuable than money.