Review Detail of Yovalo in Civilization

I found this story amazing (used more than 100 FP on it) and really would recommend it. Great concept . The world background seem a little bit vague and raise questions: how does almost all people that plays this game are in his city ? How do guilds win money (i mean that pay for player to give them ressource but there aren't any competition are they only trading Intel ? ... I still find it very good