martinibuster - 12:02 am on Aug 24, 2008 (gmt 0)

>>>There is no common similarity except what said same market, same account.<<<

No, no, and no. And I will tell you why I say no. :) The fact that five of your sites were caught in the same net, makes it absolutely clear that your sites share a common miscalculation. The problem therefore is that you may not have a clear distinction of what constitutes shaky optimization strategy, or are overlooking the cause. Because something worked for five or more years doesn't mean it's not shaky, even if your competitors or other sites are still doing well with it.

If you built and promoted five websites within the same niche, then there is going to be overlap between them in the way they were promoted, in links, in the kinds of links, in the content, in the kind of content.

I'm willing to bet you aren't looking hard enough and that it is right in front of your nose. ;)