Typical EB campaign:
First turn: disband all navy ;)
Some turns later: build single and the cheapest ship and transport your army wherever you want...

There is no reason to maintain navy. It is rather expensive whim.

I know it is banal truth: AI is stupid. AI uses navy chaotically and incidentally blocks player's ports. As a result trade by sea routes doesn't suffer regardless of lack of any naval forces you own.

So, why don't encourage players to invest in navy by establish severe money fine each time AI blockades player's port. It could simulate economic sea blockade quite well.

What is your opinion? Any hardcoding limits? Any script alternatives?