I can give a rational answer for why commodities like apples have value, or a gallon of gasoline, or a table, or a shirt. Even houses in 2007 real estate development projects in the outskirts of Sacramento have a rational (if at one time overblown) value. There is no rational explanation why a hashed number called a Bitcoin has any value. A bar of gold had value 4000 years ago, it has value today, and if the concept of commodity value exists 4000 years from now, it will have value then.
As I said, I pointed all of this out on HN before Bitcoins lost half of their value. I'm quite confident they will be halved again from their present value, and eventually hit $0. They're worthless hashes. Your explanation for why they have value would not have me comfortable as someone holding onto such commodities. Warren Buffett and Charlie ("Bitcoins are rat poison") Munger agree with me.