I'm very sad for the people that invest on this type of schemes.
I do work on my "normal job" with investments.
One thing you should consider above all, is the integrity of these companies.

To hold clients fund (EUR, USD, any currency) a company needs to be cleared and registered with a Financial Service Authority (FCA in the UK, SEC in USA, CMVM in Portugal, etc, etc).
Its the law! In Europe, America, anywhere. As crypto-currencies are not considered a financial product (although they have a market value in USD, etc), these crooks get them from people believing in miracles. They make their profit, disappear and reopen! And no one can do anything to them (lawsuit, courts, nothing, as bitcoins, etc, are not considered a financial instrument, yet).

So, be clever... if it sounds too good to be true, it probabily isn't true.

You will be better off learning how to trade your bitcoins, or even better, converting them into cash, and using a regulated investment company, with an office that you can visit and speak face to face, don't you think ?