Few days back I found a thread in Digital Point Forum where a member was disappointed because of sites disappeared from Google index. One member has replied, “so only thing they have in common is they are all listed together in your google webmaster account? “
I was really amazed and disagree with his/her reply because if it is a reason then nobody will add a site in GMA. In my opinion, submitting a site in Google Webmaster Tool is help us to tell Google about our URLs of our site. It helps to better crawl our site, how often we update our site and how much relevant importance as well. It doesn’t affect either ranking or disappear from Google Index.
Google has also clarified in webmaster blog about such type of myths.
“A Sitemap does not affect the actual ranking of your pages. However, if it helps get more of your site crawled (by notifying us of URLs we didn’t previously didn’t know about, and/or by helping us prioritize the URLs on your site), that can lead to increased presence and visibility of your site in our index. “
There could be many reasons why a certain site gets delisted. No doubt Google webmaster account has nothing to do with getting delisted. 🙂 Perhaps their site got caught up by Google’s recent crack down on paid links?