If your sales depend only on Google traffic and Google adsense or adwords then you could be in for a big dissapointment. Constant search engine rankings can make or break you. I know. I’ve been there. Riding high on Google rankings then dropping like a 2 ton rock in the Altlantic ocean.
Do NOT put all your eggs in one basket. There are several other ways to drive traffic to your site and depending on just one, like Google, is just plain bad marketing efforts.
Yahoo, Yahoo’s YPN, and other ...