Can the gourd play a feng shui role, or is it just a commercial stunt?

If it is simply a product of a merchant, it must be a gimmick. But gourd plays a role in geomantic omen. Especially those polished (at least too fragrant). Gourd has the function of storage and storage, so there are two main points in its application. First, it needs to be stored in a bad way or in a bad atmosphere. The second is hiding, and the most common is to use the treasury.