Here is a interesting, hypothetical situation. What will you do if there is a MLM scam going on and it is in early stage. It is assuring 10% monthly return in bitcoins (of course it has that referral bonus part as well but it is optional, you don't need referral as you are getting 10% on your investment.). B'cause of it's early stage, people are investing happily and getting returns monthly. In short equation of incoming source money > outgoing money. By looking at situation, let's say this scam/scheme will go on two more year. There are some people who rip benefits from these kind of scams/schemes as they invest very early and in large chunk.
Will you invest in such scheme well before it vanishes with bitcoins/money?
your question doesn't make any sense, you are saying it yourself "it is a scam" then you say would you invest in a scam. if you didn't know it is a scam then it was a different story.
and this is what will happen no matter if you go in early or late.
you go in and invest some amount, they they start paying you some profit and before you reach ROI they run away and if you request withdrawal before they run away and you reach ROI they deny your request. simple as that you lose both ways.
if you go in early you lose small amount, if you in late you lose more. in both cases it ends with loss.