There is also a psychological thing behind this story of (good) and (bad) money. People, when they feel that a coin or a bill has more value, they tend to get attached to it, as if it were a personal treasure. This is perhaps why some people keep their Bitcoin safe, hoping that it will become a kind of (digital luxury) instead of a currency that we use every day. In the end, the value we give to a currency is not just numbers, it is also a question of rarity and trust.