I would say that much of the reason for that is because of the perception of the currency that is widely held. It's not much good because people think it's not much good. I bought a few things online years ago with Bitcoin and it worked pretty much the way it should, but most of those places that accepted it stopped . Mostly they stopped due to the public perception.

I do wonder if it has a chance to become useful once it is old enough to not be considered interesting, and the idea of holding something while it increases in value dies.