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Originally Posted by cbp
If the URL in the address bar does not change, Google (and I assume other SE's) sees them all as seperate duplicates of the same site - the Google guidelines say 301 redirect. Google does not want many copies of the same site in its index,so drops them. Usually it will keep the one it finds first and dumps the rest (but not always)
CBP
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Additionally, it is a good formula for getting the whole lot banned IMO; or just as bad, a free ticket to the last pages of SERP...
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Quality Guidelines - Specific recommendations:
Avoid hidden text or hidden links.
Don't employ cloaking or sneaky redirects.
Don't send automated queries to Google.
Don't load pages with irrelevant words.
Don't create multiple pages, subdomains, or domains with substantially duplicate content.
Avoid "doorway" pages created just for search engines, or other "cookie cutter" approaches such as affiliate programs with little or no original content.
These quality guidelines cover the most common forms of deceptive or manipulative behavior, but Google may respond negatively to other misleading practices not listed here (e.g. tricking users by registering misspellings of well-known websites). It's not safe to assume that just because a specific deceptive technique isn't included on this page, Google approves of it. Webmasters who spend their energies upholding the spirit of the basic principles listed above will provide a much better user experience and subsequently enjoy better ranking than those who spend their time looking for loopholes they can exploit.
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