Bitcoin is digital cash, but his potencial is very above then the gold, soo some people does use bitcoin to store value against their fiat currency, as well used for saving purposes as well investment at the same time. For me bitcoin is the digital gold, with amazing potencial to grow.
I too think bitcoins got a good potential, but I will never grade it more than gold, not in terms of market price but to hold it for a long term. Gold is gold and nothing can replace it. Bitcoin is another good option for an investment since its prices are more volatile so I don't want to keep more money in bitcoins. Because it has a chance of going up and down quite fast so I will invest more in gold and less in bitcoin.