After five straight years of exponential growth, Bitcoin should have earned the benefit of the doubt by now. After one year on the market, it's value went from fractions of a penny to $0.05 USD, which is borderline infinite ROI. The next year, it rose to $0.30, only a 500% increase in value. Good luck getting that anywhere else. 2011 saw BTC rise to over $6 USD, which was just scary growth. The next year, it only doubled in value, a real "off year". 2013 was a rebound year, and it finishes up at almost $800! Mind you this was mostly because of the Mt. Gox Bot Buying Bubble, and the Chinese market having free reign at an initially unrestricted BTC market.