The same reason we cannot go to "using no money".

We, the planet, are not ready for that step.

And, what you know of "free-energy", i would classify in the area of magnet motors.
What you title electro-gravitics is not free-energy. And the free-energy does not come from the aether, it comes from creation.

So, we will take steps. We will learn about the aether. We will actually learn about electricity, and how one spinning object over here, makes that object over there, connected with wires, also spins.

Do not fear, the energy will be free enough.
And as we learn to grow up, and stop wars before they even start. And make sure everyone is fed. (without coercion, or state violence) And when everyone feels that they can get what they want, then we will be able to move to a state of "no money".