I Am an Urban Ghost Policeman. Is There Something Wrong with the Prostitution System?

I'm an urban ghost, and I've awakened the "world's most despicable" system! You said that the name of the system reminds me that I am going to be a bitch, so it's okay for me to use the power of the underworld to prostitute the system for free! As the saying goes, the cheaper you are, the stronger you are! It's me, Wang Xiaoyi! In this world of oligopoly system upgrade paths, others need millions worth of upgrade crystals to upgrade their systems... And what about me? Zero cost! Mass production! Does someone else's magic weapon cost money? My exercises are cheap and cheap: "Look! Urgent again!