I once tried a scam "investment" site for fun, knowing that they are not going to last long and operate like a Ponzi scheme. Daily interest was about 3.6%. I figured out, using the "rule of 72", that if the site survived for more than 20 days I will have my ROI.
I was luck to join early and the site did survived for more than 20 days, and I withdrew everything. So I doubled the little investment of 0.01BTC to about 0.02+BTC. About a month later, the site closed down and many investors lost their BTC.
In short, almost all BTC investment at the moment are scams- please correct me by letting me know if there is any valid investment site....
The truth is, every ponzi/hyip programs work like that way. They initially pay to the investors, just to build reputation. but when the big investments start flowing in, they stopped paying. Ponzi is the worst form of gambling available in the market.
However, you should try p2p lending platform like btcjam. I am using this website to fund loan for others and getting a stable monthly returns. Here the risk of loosing money is very less. Every other programs I have tested turned out to be a scam.
