Bitcoins can be good way to store money but i dont think there are allot of peopel wants this because when you store bitcoins as the meaning to safe money and the price drops allot all your money is gone.
Only few people believes that the price of bitcoin will decrease with the passing of time so they save their money in their computer which is safer than the bank holding the money for you. Banks can be stolen just like bitcoins but with bitcoins its the user responsibility to safeguard his coins. Bitcoin is a good way to store money.