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PPC at a minimum of 5c per click won't be profitable for about 99.5% of my pages, so it goes back to "content is king"....been trying to add content recently anyway but its a slow process and the content on my main affiliatte-style site is being treated the same way (number 1 billion or whatever in search results) even though the content pages have no affiliate links.
This is painful.
Other sites don't do well with the search engines, and I never thought they would. Too much competition and I'd need a million backlinks to ever do well in the SERPS. Intelligent use of AdWords solves this problem.
You need a real site with real content, the affiliate links need to be incidental advertising, not the core of the site. That's my best advice.