It is impossible to legitimately guarantee any kind of interest or profit with high percentages like that without some other shady dealings/transactions.

I have been part of a group for nearly three years that has a very similar model for earning profits. No, I am not advertising or inviting anyone from here. The point is that in our small group the principal can reasonably be guaranteed, but never the ongoing profit. Two times in 35 months I only received my $500 back. I average $20-$30 profit each month...and I'm still using the same $500 from three years ago.  Some will scoff at such "low profit" but hey, it's a tank of gas or a nice meal out each month. I also know I will have my $500 back on the 14th in case some need arises.

If you want to stop getting screwed I think people need to build their BTC slowly. No more than 10% of your BTC should be in this kind of high-risk stuff. Stop thinking some random person in a forum is going to give you the Tom Vu ideal lifestyle. 99.999999% of the time that poster is probably a Tom Vu in disguise. The only people who get rich are those who will take advantage of your get-rick-quick greed. Forget the luxury yacht...and set a goal to earn tank of gas or candy bar instead.