Live advertising on Google

I just noticed that Live now advertise on Google.
How peculiar that a Google's competitor would pay money to Google, just to have a user redirected back to its own search engine results page.
Knowing that the overwhelming majority of our own visitors prefer Google, I guess I shouldn't be surprised that Microsoft will spend lots of money, just to remain competitive as a minor player.
But paying for keywords and hoping users will click on the sponsored link instead of the organic results seems a bit naive to me.
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