The only way to make money now is to find this:-
http://www.forbes.com/sites/kellyphilli ... 9-million/
Win-win doesn't exist, and "betting on betting" is effectively what caused recent financial crashes. The more extensive the scheme, the less secure it becomes. Ultimately, for a currency to have any lasting value, it must be exchangeable for real goods or services. Retailers are slow to go for it, and may never do so in any meaningful quantity. Then, exchange rates are set outside of any international mechanism, so there's no safety there, either.
Oh, and your profits are taxable ...