Isn't that basically what bitcoin is?
He can hardly buy anything with it. We just give it value for the sake of giving it value.
Matter of fact, let's do just that for the heck of it, see how far we can go with it. I'll pick up a rock and call it Akorn and put it up for $10. I'll buy it back for $10 and let's see how much it'd be worth by the end of the year.
Lol! Probably that's your perception towards bitcoin! But it doesn't mean that you are correct. Now when you say that people can't buy anything with bitcoin, I would point you towards an website,
Coinmap.org
You will find a map based list of merchants and ATMs worldwide that transacts in bitcoin. Also did you ever heard of purse.io website. You can buy anything from Amazon using bitcoin. So your point is invalid!