The fact that it created value out of nothing and rallied up people globally.
This fascinates me the most too.
Yeah, me too.
However that is not a fact. It did not create value out of nothing, it does have practical use in the sense that is the first currency that allow a person to securely send money to other in a remote location without needing a trusted third party. It solves a problem that would otherwise cost you money, so it is not accurate to say that it created value 'out of nothing'.