Profit and loss feedback mechanism. Walmart lets things be a little dirty and inconvenient on purpose, because that lets them deliver products at the prices their customers want. It's not like Target is keeping floor buffers as a trade secret from Walmart, they're just aiming at a different part of the market.

Countries with state-run grocery stores have also run them inconveniently and neglected their hygiene but they also didn't have enough goods stocked for the public.