Answer

There are alleged Feng Shui “experts” who go crazy with salt. They are anachronists and fakes. And should be lucky they live in modern times.

Salt might be cheap now, but that is a very recent event in human history. Even in 1930 the Dandi Salt March was necessary.

Governments in ancient China exercised a monopoly on salt, beginning around 670 BCE.

The foreigner coming to China earlier in [the 20th] century would be struck by the care with which salt was treated in the countryside. Salt was a government monopoly, heavily taxed and therefore expensive.

— T.R.Tregear

Salt once formed a primary source of income for European governments (including the British Raj). Europeans once considered salt as sacred because humans and animals cannot live without it, while Africans once used salt as money.

Salt was heavily used in the simple foods of most premodern Europeans (twenty grams daily per person, according to historians), but there were frequent riots against the universal (and expensive) government salt taxes.

Food was often of poor quality and available in meager portions; salt stretched dubious vegetables and meats, and made the otherwise inedible at least palatable.

Salt was far too precious a commodity to waste by tossing haphazardly around the house.

Consider also how incredibly stupid it is to salt the soil around you. Salt sterilizes the ground so that nothing grows.

This is the ancient equivalent of the Darwin Awards. In olden times, any farmer who tried that technique one year wasn’t around the following. So this lunacy was bred out of farmers, only to erupt in city-dwellers without any connection to the planet.

The practitioner is a fraud, claiming for feng shui some techniques that are not part of feng shui or of Chinese culture.