@Imperious-Leader
Hi IL,
I can see that some TTy in Siberia did not worth a real boost in economy.
Your suggestion made me think about a way to expand my first idea a little bit more, even if it is not truly accurate/realistic from a geo-economic POV.
When invading a Zero IPC island TTy with an amphibious assault, if winning get 2 IPCs.
If defending side won the battle, he get 1 IPC.
If it is a Zero IPC continental TTy, the invader gain 1 IPC.
It remains a bonus given through the result of a combat. No additional economic value to keep such islands on subsequent rounds.
That way, it is an incentive to fight over these TTys nonetheless.