I think this question is complicated, and so I'm putting the points at 500. I've read much of EE on this topic, but am still suffering lack of understanding.
I work for someone who has 10 domains;hosting about 7 of them... (actually 43, but these 10 are all alike), all hosted with 3 different hosting companies, and all the content is 99% identical. I notice he doesn't show up in SERPS in the first 100! except the one I started SEO on last month....
Example of the domain names - migraine-treatments.net, headache-cures.com, instantheadacherelief.com;
and I'm redesigning the "look" ....with www.migraineandheadache.com/indexnew.html
---ALL THE CONTENT (except the new/mine is laid out completely different) IS EXACTLY THE SAME WITH MAYBE AN EXCEPTION OF THE OPENING HEADER STATEMENT, AND THAT ONLY 1% DIFFERENT.
My question is why would someone do this, since I am now the web"master" (designer) for this company, the only difference is a few keywords, but since it is ONE PRODUCT, and the keywords are so diluted in over-abundant text (over 3,000 words-YES I'm changing that with the new style)....they are not that different. Bascially, is this a useful tactic??? - to take the LONG LETTER style page he's been using, and target say NATURAL CURES -...except from my standpoint since it is way down on the page (too many words on the old style) - it won't rank for much anyway BUT WOULD IT WORK FOR THE NEW STYLE GIVEN ANSWERS TO THE BELOW:
1..My concern is duplicate content penalties: Can/is this cause for penalized marks from Google/Yahoo? Do they EXPLICITLY EXCLUDE your own sites from this duplicate content penalty? Since the keywords are SO similar, and can be handled with linked pages of a particular topic.....
2..How do affiliates play in? They often duplicate the exact wording of the item in their sales pages? We have a good number of affiliates.
3.........So that is my question, what should I do? ?? So I will know whether I should take the new style -once completed-, and put it on ALL his domains for this product, working different pages with SEO ...................or as I'm currently thinking - keep one old style, and one new style, take the other 5 domain-names and point them to these two hosted sites, closing down paying to keep all these domains hosted.
Thanks a million (points)