Mr.Phoenix,
the idea of dominating a "construction" is excellent. But already have been "normal", the model presented does not exist in any game in the world.
It would basically just a logical formula:
Assuming that there are only two races in the game, then 100% of existing territory in the game, 20% is reserved for race X and 20% for race Y! The character of the "birth" will have 20% of the territory as guaranteed game "territory of race-specific birth" to explore, even if the enemy can exploit to go there too, but it can never be taken by the enemy.
100% of the territory, adding the idea that there are two races, were 60% of the total area to be dominated, exploited and signed tax.
To fill the domain creates a new territory or server when everything is "crowded" with the dominant race that ends up having financial advantages in the game.
concluding, the idea of JohnnyPhoenix is perfect but the one I had would be innovative.
attentive to detail here in Brazil.