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George, you ask the hardest question...
Mostly, it is because link sites for the most part don't just want a site to list, they want a try at a traffic trade. That is the same reason we want return links and other link sites on the page. We know that doorways will, for the most part, be rejected or ignored by the search engines.
There are hundreds of other little reasons, some of which even have to do with respect.
There is more... but that is enough to start.
Alex
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