No because Chromebases are cloud based and therefore they utilize the Internet to play music, games, or applications. This does not mean that you cannot download content to a Chromebase or Chromebook and still utilize...
Yes, Chromebases are secure because it enjoys Google's security services since it operates under their Operating System. Data is protected under multiple layers of security.
It all depends on what type of Chrome Base you want and how much you want to pay. As of April 1, 2015 Acer announced the first all-in-one Touchscreen ChromeBase. To date their not many if any at all that are...