TweetIt's basically like buying a share of something in the stock market, but it's also a digital currency that you can spend. Like anything else regarding the stock market, it goes up and down. If you buy "x" amount of bitcoin, the dollar value isn't going to remain as the same value you purchased. You could purchase $100 of bitcoin today that might be worth $200 in bitcoin in the next few weeks... Or, you could purchase $100 of bitcoin today that might be worth only $50 in the next few weeks if it drops. I purchased $50 of bitcoin a while back that was worth $52 buy the time I got home. It goes up and down. Right now it's skyrocketing, but for how long? If it plummets and you don't cash out beforehand, just like the stock market you could lose your money.