Although there are risks in the market, an optimistic attitude and a long-term perspective are the keys to success. The cost of missed opportunities is often more fatal than the short-term losses caused by financial turmoil. As Charlie Munger said: "Optimism may make people dumb, but pessimism will never make you rich."
Yandia : nah, there's no any cost in missed opportunity for btc, your money stay the same, it just didn't grow. It'll be more fatal if btc market change direction the moment you buy it.