Bitcoins only known use is buying drugs from an internet black market.
I approve.
When they're low, you can buy up a bunch and wait for
greater fool theory to happen and cash out big. Some guy on reddit took out $30k in credit card debt when bitcoins were like $20 a pop and then cashed out just $30k when they hit $100 or so. Then he sold the rest where they were like $200+ so he made like a bajillion dollars or something.