It's to give the Countries of the World a false sense that they actually have the freedom to be Independent, under the guise of being "affiliated" with the World Government.
The Celestial Dragons/Gorosei/World Government act under the pretense that they are a governing body, and the decisions made across the World are of a collective decision amongst them.
In reality it is one man/woman ruling over everything, and the entire World is none the wiser. They believe there is some kind of Worldwide Democracy going on, when in reality, it's a Worldwide Dictatorship......
The Greatest trick the Devil ever pulled, was convincing the World he didn't exit..... That's Im.....