I have an Apple Bluetooth Keyboard and Trackpad, so I certainly have a use for Bluetooth on my Mac. The Keyboard is easily paired with my iPad and I have a case that holds both, so it is handy when I don't want to carry a full blown PC. I don't use it a lot, but it is handy and I'm sure it costs the manufacturer mere pennies to add.
GPS on a WiFi device may not be useful as a full blown navigator, but with so many of Google's services and other apps being location aware you really notice when GPS is missing. There are so many uses for a location aware tablet that are lost on the Fire in it's current form. It was one of the main reasons I returned mine.