Your margins care, since those are a factor of installation cost, marginal cost and energy lost due to round trip efficiency. That 70% loss defines the lowest

Your margins care, since those are a factor of installation cost, marginal cost and energy lost due to round trip efficiency. That 70% loss defines the lowest possible price difference between buy cheap power and sell expensive. Therefore any other smart consumer or storage has that margin to work against, to compete you out of the market. This is why batteries can work, in some cases. But it is a pure inefficiency that will find a minimum equilibrium.