This illustrates even more vividly why it’s incredibly dangerous to invest in anything you don’t actually believe in, and aren’t willing to hold, long term. If you aren’t going to hold something long term, then generally you must believe that while the price will rise in the short term, it will not continue to rise in the long term. If you hold this belief, it generally means that there’s some reason that you believe what you are investing in won’t hold true value long term, but that there is enough speculative mania in the short term to make the price go up anyway. The thinking goes that if this is going to be true, you might as well profit from this speculative mania and buy in now, wait for a little bit for the price to rise, and then sell it for short term profit.
A very cautious investor can buy on an exchange and then store the bitcoin code off the site or even on a piece of paper — that's what the Winklevoss twins and bitcoin early adopters have done, going so far as to cut up their code into pieces and store it in a vault using a system that only they understand to put the actual bitcoin code back together.
Please note that virtual currency is a digital representation of value that functions as a medium of exchange, a unit of account, or a store of value, but it does not have legal tender status. Virtual currencies are sometimes exchanged for U.S. dollars or other currencies around the world, but they are not currently backed nor supported by any government or central bank. Their value is completely derived by market forces of supply and demand, and they are more volatile than traditional fiat currencies. Profits and losses related to this volatility are amplified in margined futures contracts.