A couple other factors Googlers mentioned:
- URL complexity
- Page freshness
Honestly, it has nothing to do with trust, or doubting the accuracy of your statements, at least for me personally. Its just that I am part hacker, and there is a bit of a philosophy to that side of me: The only way to learn anything, is to question everything.Originally Posted by Webnauts
The best way to learn anything, is to question everything.
WigeDev - Freelance web and software development
I felt like posting this information, which clarifies pretty well the affects of the supplemental pages:
Got Supplementals? Accepting PageRank is Only The Beginning » Half’s SEO Notebook
and
Google Dumps Supplemental Name Not Index
I have a lot of these problems but I'm working to correct them. I notice everyday I have more in SI and less in main. Yesterday I made a robot.txt file including all my showitem.asp. Each one of those will be duplicates in the eyes of the SE. My question is how long will it take Google to no longer list those pages as SI so that my ratio isn't 95%. I also cleared alot of useless pages off my website. These were pages no one linked to anymore. I didn't realize those would cause issues if there was no link from my site to them.
I'm taking baby steps but I am trying. Seems the more I do the worse it gets but I think that is because I was clueless before I started picking the gurus brains here.
Best, Nicci
I am dealing already with some sites and I am facing the same issue. No need to worry. Pages that had to be in the main index have been in the SI and vice versa.
The issues you see will be solved when Google will update the SI. And I noticed so far that takes place once a month so far.
So stay cool.