indyank - 2:50 pm on Jul 3, 2013 (gmt 0)
If the user is reading an informational page and, say, your first use of the "blue widgets" phrase on this page is a contextual link, I think the reader might naturally expect that clicking it would lead to more information about blue widgets.
This is interesting. Assuming "blue widgets" is a product, linking to an e-commerce page does sound good enough as clicking on it would lead the user to the product page that might have pictures, videos (if any) specifications and its price. Isn't this good enough information for a product?
Wikipedia is a pure information site and hence all their in-content links lead to more informational pages. So IMHO, it might not be a good baseline to use in the Google algos , for these scenarios.