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sem4u - 10:42 am on Sep 13, 2007 (gmt 0)
Yahoo: 94,193,343 Amazon.com have 19,500,000 pages in Google. Is your site going to be able to attract links like these sites do? Is your site unique enough for search engines to care about listings? If the answer to these questions is no, then I see that the vast majority of these pages never being crawled or ending up in the supplemental index.
Let's take a look at how many pages the top 3 search engines have of wikipedia.org
MSN/Live: 4,052,389
Google: 12,900,000