I can understand your dilema. Remember that AdWords can be set to 'content' too which would display your advert on lots of other sites in addition to the main Google site. Also, there's no guarantee that you're number one natural position will stay that way.
One more thing, you're Google advert can be set to 'certain messages' and doesn't have to be set to your home page. It may go straight to a special offers page, for example.
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