Why don't we start using crypto currencies as actual currency rather than just using it to buy and sell. It is decentralized and worth nothing but what you want it to be worth so why don't we use it for it's intended purpose? Fluctuating prices hurts it as a currency because I don't want to buy something with 10 coins and then the next day the item is worth 3.
Probably because there is limited reason to use them as one since they just keep going up and its so volatile that you can't price anything in them. Aside from privacy, limited reason to use them for right now.