Consider what  various marketing research firms have found in their studies:

“81 percent of internet users find the websites they are looking for through search engines.” *ITMarket Firm

“Search engines create more awareness  for websites than all advertising combined including banners, newspapers, T.V., and radio.”  *IMT

“Search engines are the most effective form of advertising.”  *IMT

“Over 80% of search engine users find what they want on the first three pages. Today's top U.S. search engines, such as Yahoo, are collectively responding to well over 300 million searches per day! Google alone has 300 million pages in there index. If your website is not appearing within the first few pages (when searching for products and services), you are missing hundreds, possibly thousands of highly qualified leads. It makes sense to target people who are already looking for you in the first place.” *ITMarket Firm