1. People see it as a store of value
2. It has some useful physical properties
3. People use it as a decoration
Possibly there are other reasons as well, but those are the ones that come immediately to mind. As far as I can tell, Bitcoin only shares attribute #1. It doesn’t have intrinsic properties that make it useful into larger systems (though perhaps we just haven’t found the right systems yet?), and people don’t feel it’s intrinsically valuable. Not to completely bash Bitcoin though — if enough people find it valuable it can become a useful way to exchange value. Right now it’s just pretty bad at that.
