I've created this, in order to keep the introduction topic more clean...


And here it starts:

- Storage den should protect LESS resources than you spent on it, so I'll call that every level should cost as the total storage size inside...

Level 1:
Cost: 50.000/25.000/10.000
Storage: 50.000/25.000/10.000

Level 2:
Cost: 100.000/50.000/20.000
Storage: 100.000/50.000/20.000

And so on...

For building level 2, you'll need total of 150.000/75.000/30.000 to protect 100.000/50.000/20.000 resources... So in order to protect 1.600.000 / 800.000 / 320.000, you'll need to spend 3.150.000 / 775.000 / 310.000...

And in the end... At level 1, it starts at 100% resources spent for the storage... And going higher makes it closer and closer to 50% resources spent for the storage...