Well Doug, they all wear out sooner or later....and how soon depends on how you are using the brakes. It actually can be sort of easy to ride them without knowing it, especially in a plane that might be new to you. I do tend to use more right brake than left - but I'll be honest, I am also getting 400 hours on a set of pads. You probably should take the wheel pants off and see if you're down to minimum thickness - a kit with four pads and rivets doesn't really cost that much. I've never heard of re-burning them, but maybe I'll once again learn something new from someone here!
Paul