I enjoy crushing my enemies, seeing them driven before me... etc. just as much as the next guy. But when I am the one crushing and driving, sacking city after city, I expect a little... groveling from those who seek my mercy.
Time after time, they beg me to bring my armies home, but never give me the... respect i'm entitled to. Please make it where the enemy AI offers me tech, gildar, an artifact, even a hero or two or outposts to convince me to let them remain an independent state.