Maybe the fact that bitcoin is digital currency! Psychologically people believe more in those things which they can touch. And also the fact that we do not have much options to use it.
That is very right. Although there are many ways to use it I guess people wants something that can be done in the worldly manner. I mean a trade that can be seen or be touched just like you said. They dont want something that is used blindly or a thing that is like in the air only.