i don,t know why people are saying that it is gambling.Bitcoin is a crypto currency and exhibits all the qualities of a virtual money, there is no way one can Bitcoin can be compared to Gambling. Gambling can be defined as taking risk in hope of better results, one can put some money in casino, betting or any other sport. In gambling only thing which works is probability but when you put money in Bitcoin can be termed as Investment rather than Gambling, moreover Bitcoin being a currency is further used by the people for Gambling but having Bitcoin cannot be termed as Gambling.