I had two clients from America I want offer graphics designing jobs for, I demanded my payment would be in BitcoinBTC or Ethereum. To my greatest dismay, they were dumfounded on what Bitcoin or Ethereum is. I am still suprised up to this very moment. 
You are surprised that they don't know what Bitcoin is? And do you think it every there that deals with the internet , work or get updates on currencies. Haven't you seen people who work nature or schedule do not even permit to know what going on around. Some might have even heard about Bitcoin but not pay attention to it. While some already concluded it's for internet fraud stars so they have nothing to do with it.