In reply to jolivague: can't remember where it was but I read a good book about investing a couple of years ago which said the first rule is don't invest in things with no intrinsic value.
Bit coins by definition have no value, they are only worth what people will pay for them which means that if people go off them overnight then they can drop 99% of their value. Same was true of the dot com bubble, the companies had little intrinsic value, just hype.
Gold on the other hand is a useful thing, you can make electronics out of it and it has an established history of value, it won't suddenly drop 90% in a day. On the other hand it won't rise 90% in a day either.
The higher the risk the greater the potential reward but also the greater the potential loss. By all means speculate with Bitcoins for a laugh but only do it with money you can afford to lose.