No, it's not just "one server"... it's the needing to have floors or servers, let alone multiple locations w/ employees (yes, all that is needed to run and process your card transactions).
You don't get it do you. Those are needed because credit cards are accepted as a common payment processing system worldwide. Bitcoins and the power sucking network are not needed at all because its an answer to a problem that doesn't exist. Which makes it a TOTAL waste of electricity. How hard is that to understand?