Investing in cloud mining, doubler sites and going for gambling are the mistakes committed by most of the newbie as even I have made that mistakes in the past when I was newbie so we cannot blame them as its an common practice in bitcoins.
There you can get money only with great luck, but as a rule, many just lose money there and miss the opportunity to start making real bitcoin.
So you are not aware that those type of investments are scam? You even don't need have luck for it. Because most of the newbies are thinking that it is an easy way to earn bitcoin but the real thing is that those ways are truly fooling us and it's a scam attempt for those people that are lack of knowledge in the bitcoin economy such as newbies.