If you take a snapshot in time, maybe. Over the long term, any batteries sold are good batteries, because batteries exhibit large economies of scale. Profit o

If you take a snapshot in time, maybe. Over the long term, any batteries sold are good batteries, because batteries exhibit large economies of scale. Profit on existing sales can fund new production facilities; incremental improvements in battery technology; R&D into capacity increases; improved distribution networks; R&D into new sources of lithium; and so on. The way you get dirt-cheap storage is to build lots of it.