Doorway pages or Gateway pages are pages that are optimized for one key term but are really designed to be gateways to lead you to a different, central page. These pages usually have very little original content and provide a poor user experience.
This used to be a common technique, but Google has started removing doorway pages from their search engine index.
Some examples of doorways include:
•Having multiple domain names targeted at specific regions or cities that funnel users to one page
•Templated pages made solely for affiliate linking
•Multiple pages on your site with similar content designed to rank for specific queries like city or state names
To answer to your question: definitely not advisable but it depends on which area you want to compromise, for sure your site will be removed from search index, so its up to you to increase visitors using these pages at the same time decrease the search index.
For more information go to:
http://www.seologic.com/faq/doorway-pages
Bharath Vasireddy