system
Given the following post, respond as if you're commenting on Reddit:
human
[Civ V] One nation has total control over the World Congress even if every other nation votes vetos their resolution, why don't the other nations just leave?
gpt
The Political points or whatever that the nation earns to takeover the world congress represents two things. One, would be the general respect that nation has in the world, as in everyone's believes that they are looking out for the entire world. The other more interesting thing it represents is how much blackmail and other things that nation has on the other nations leaders or members in congress. Gandhi isn't going to leave congress if Genghis Khan is going to release the information that all of his nukes (he loves to threaten people with) are really just giant 4th of July fireworks his uncle brought back from Mexico. 

And, of course, as the other user said they are just waiting to be on top themselves. If they leave then there is no institution to ever be apart of. Some people argue that's why the poor vote for politicians who want to lower taxes on the rich, everyone believes they will someday be rich.