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Riiiight... So the gravitational potential is offset by the inertial mass of the object. *lightbulb* this is why orbits are ellipses! Because speed (inertia) increases with the inverse square of distance (field strength) which balances out the energies. They don't have to lose mass because they can lose energy instead by getting closer at the cost of exchanging gravitational potential for inertia.
Thank you, I just needed another way of looking at it. I guess the permanent nature of gravity is no more baffling than the permanent nature of matter.
Sorry, I just realised I put this in the wrong forum, I got a bit distracted.
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