Satoshi knew that bitcoin would get to this point and he took his time to develop and build the bitcoin master plan. He envisioned it far beyond just using it as a means of digital payment he also knew it would be a good store of value which people would want to hold onto to measure the value of their wealth. For bitcoin to have gained this popularity people saw it just more than a means payment but just as satoshi has envisioned.   There it turned out to be a store of value which made it more popular and volatile.