Hezekiah (king of Judah) had been giving money [tribute]  to Assyria. Then at one point he stopped. Then the king of Assyria sent an army against the cities of Judah. So Hezekiah said to him "I am sorry. How much  would it take to make peace between us?" Assyria gave some staggering amount and Hezekiah sent it to him. Then the king of Assyria sent an army to conquer Jerusalem.

The lesson seems to be: Do not compromise with the Dark Side. They get a taste of victory and then they just want more.