Then the correction stands and I take it. If the fiat comes out of a different pocket, the sats never touch the business: the shop funds a savings plan, and the stack is not working capital. That is a cleaner position than the one I described, so the question moves. The fiat has to come from somewhere though. If it is other income, the bitcoin-only half of the shop is carried by a fiat half, which is fine and worth saying out loud, because it tells you how long the position survives a bad year. And the day a supplier does quote in sats, the invoice stops being a pound number you settle later, the price risk moves to him, and your margin stops drifting with the exchange rate. That day is the real test of never converting, not the checkout.