Bitcoin has value because it is the fastest, cheapest, and most secure way to send money to anyone. Unlike fiat currencies, bitcoin easily lets you pay people who use other kinds of money. And it does not require trust in a third party. That is the most powerful idea in money in at least 100 years.
Whilst I'm a massive fan of bitcoin, it might be one of the most revolutionary ideas in money in the last 100 years, but as it stands it isn't ideal as a currency or a store of value. I just hope one day that the price will stablize or level out or maybe we don't even peg bitcoin to fiat and it becomes its own value.