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Top search engine rankings can rise and fall quite a lot so any sites that are happy making money from a few top keywords are in a dangerous position.
I have had experience with marketing sites to catch thousands of low traffic keywords and they all add up to a lot of extra traffic. If these keywords are related to the main genre of the site then even if it loses the ranking on the main keywords there is still relevant traffic to back it up.
Having a wide spread of rankings is also a good way to get more 'authority status' in the search engines I believe.
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