You buy Regions using the Ratio explained above, and so on. This deppens on amount of Days in Protection. You will Freak when you see how fast your NW grows. When you come out of protection, get ready for serious action, a target is picked for the day the team gets out of protection, or the next day. After Protection Region Placement stays the same.
Most leagues have Investments.
When you MAX your Bank and Investments you will NO longer need to place your region gains in Mountainous. The Region Placement is the same for the whole game. Keep an eye on this. This Makes you Double then what you would make by selling the tanks regularly, AND is Cheap like hell for your Teamate to buy. It's Extremely effective.