Earlier quoted context omitted.
More inefficient than producing and maintaining paper currency? Than mining actual gold? They really are just throwing tons of electricity and hardware at "nothing", but if this kind of activity helps replace the current inefficient systems of currency, then I'm all for it.
Yes? Going either by volume or number of transaction, Bitcoin transactions are currently ludicrously expensive, though this is somewhat hidden by subsidizing the miners. I don't know why you mention paper currencies and gold when most money today is transferred electronically, in a far more efficient way than Bitcoins.
Revenues of Brink's alone, sayeth Google, are roughly $4 billion. My understanding is that a substantive portion of that represents cost of transporting cash and gold, and of course they are only one of several such companies.