Interest or no interest, if I am seeing sites for things like cloud mining and investments, I can spread a single Bitcoin over ten of those sites. I do not mean that literally. I just mean that you can have one risky investment of 1 BTC or 10 risky investments of 0.1 BTC. With the one investment, perhaps the payoff may be bigger if it happens, but if you have them spread out you may be able to hedge the lose. But, do not forget that greater than 87% of all the mining, investment, Ponzi, honest Ponzi and other sites like these have failed in the past three years, more like 91% if you look at just last year. This is because there are those type of businessman that follow the trends and make money off those trends. Most are not dishonest, they are just selling what is popular.