The "commission" paid by the shopkeepers was where Lin Chengxing and other immortal city errand cultivators made the majority of their money. After realizing his appearance could easily make people trust him, Lin Chengxing had some devious thoughts.
Therefore, Lin Chengxing once tried it out. However, after getting more commission, he stopped it.
In his eyes, it was just a small profit.
Moreover, how could one not get caught if they did too many risky things? At that time, his reputation would be ruined, and he wouldn't be able to work as an immortal city errand cultivator. He would even be beaten up by the cultivators, who were angry out of humiliation.
Therefore, Lin Chengxing decided to make a big deal out of it!
Obviously, he had succeeded.