United Country Bonuses?

This is just a rush of an idea because I've got to sleep, but what if split areas such as Russia, Canada, the USA, China, Australia, and Brazil got bonuses in income for being fully united?

I see people going through quite costly trouble, from fighting people endlessly to just wasting tons of units and time, to unite an area that they liked.

What if this could be a tactical choice?

I'm not sure if this is a good idea, I rarely have them at 4:30 in the morning, but I thought it was worth posting to give a shot ^_^

Altough i like the idea,it seems imbalanced,espacfully in a smaller scaled game when theres 1 guy in each area.