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 itself is not very well composed
More specifically, you consider a situation from a purely hypothetical point of view (which you admit yourself), and at the same time ask us for a non-hypothetical reply. Therefore, I don't think that it is a correct question. It is like asking how long ago you stopped beating your wife if didn't have a wife in the first place. Purely hypothetical and on purely economic grounds, yes, it might make sense to invest in such a scheme, but in reality you can't know how long this scheme is going to be paying out (unless you are the guy behind its creation, of course)