I suggest investing on some legit and trusted bitcoin doubler websites. You can find some in this forum which you can trust because many of the users are being paid by them here.
I dont agree with a bitcoin doubler. Companies also want some profit. So what can they earn with this doublers. It will always be at the losing side or just preparing for that big scam that will happen when all are ready and large investors came.
I have trid to follow many "doubler" or to detect them very early.
I have generaly be paid or scammed...
Not once I was not paid because the ponzi has not faound new investors.
Globally I have lost a little.
I do not know exactly.
But I believe I have definitively stoped to invest in doublers,not because it is risky,but because of the many scammers who could pay the first investors,but keep up the "pay in" and not the "pay out".
I prefer programme the investment systems myself...so I sure that the webmaster is not a scammer because I know him (lol)