Holding bitcoin for price increase must be a wise decision than investing it into trading or gambling or any other HYIP programs. Holding bitcoin must be a passive way of getting interest for the invested money. If you believe in the future of bitcoin then you should leave your bitcoin sleep that will get you more profits in a passive way.
You are right. Investing into bitcoin and holding it for longer period would be a way of making fortunes. Satoshi must be a
good example for this. If he would have spent all his bitcoin then he will not be billionaire by this time. Just holding the bitcoin is the reason for his success of becoming a billionaire. Let us hold to become millionaire.