There is a pile of rubbish in your house, which will attract flies. If you want to keep your house clean, you must remove the rubbish. It's no use driving away flies.
So you're right. It's the same reason that Mr. Fang always lets you rank. .
Most people only eat Dan Pigu, and the rest eat nothing. I'm sure one only sells goods in the name of Pigu, not the real Pigu.