In newspapers worldwide, the two words Glory List repeated over and over. However, although the list contained every guild in the world, the Glory part referred to something else. Ten Guilds of Glory are the most powerful in the world, irrespective of their origin.
These guilds were all belonging to the legendary S-rank. According to the World Summit agreement that happened a hundred years ago, any guild that reaches this rank will be acknowledged by all nations. Therefore, S-rank guilds had the right to enter any dungeon and go to the other world.
This was not a ploy to make the powerful guilds richer. These superpowers rivaled countries with their strength. It was to increase the strength humanity had. Therefore, these guilds were given the right to venture into any dungeon they desired, as long it didn't belong to other guilds.