As far as i am concerned, I would write an article then in the article link to details that support the article on my own site.
A 500 word article is sold then a multiple detailed explanations of various potions on the site for those wanting more details and references to the artcile. That way you have unique published artcile in distribution, and related on your site - all unique.
I would also put into any legal document that after 6 months or a year you could then publish the article onto your site. This way the purchaser gets value and you get the long term value - which is as it should be since you wrote it - for your site.
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