But switching paid search platforms is considerably hairier, especially if you have a large Adwords account with well built out campaigns. There's no way to drive anywhere near the volume of Adwords on Bing, especially once you're running at the margins. So unless you're willing to take a huge hit to business while moving some or all of your ad spending to another engine, there is no real choice to switch.

This is both the beauty and terror of Google's business model. Don't be evil?