What we are needing of gravity is a definition in terms of gravity to know the graviton particles weight and behavior. Much as we measure the value of a life in terms of life, or are supposed to do. In this way we are free to understand the concepts. Why can't we convert Life to money, we already do. The holocene is becoming known as the next great extinction event. We're largely converting Nature's largesse to prosperity in the process dangerously depleting it. But no, as far as we understand money and life we have no conversion formula that isn't biased, as much is measured in terms of victory and failure with money viewed as a tool among other things.