I have a client that owns a very large content based site and forum. The topic is medically related and her site is by far the largest community online and probably has more information about the topic than any other website. Last June, she fell from position 1 to page 3. Long story short, and "SEO Expert" told her today that the reason her site is not ranking is because of her "Store". Since its on the same domain it takes away from her "content" and is dropping her in position. I have NEVER heard of this and believe its truly more Stupid SEO advice that is constantly thrown around. Opinions please. Can simply having a store and selling a few things cause all of your content to be dropped. Keep in mind she is the oldest site on the topic and the site was first launched in 1998.
Thoughts... Comments... ?