ColourOfSpring - 7:43 pm on Aug 5, 2013 (gmt 0)
Google's PageRank formula wasn't designed for the commercial Web, and ranking factors that rely on site or page content aren't a great fit for e-commerce businesses, either. In some ways, it would make a lot of sense for Google to split off "transactional" search into an entirely different product with its own metrics, expectations, and (conceivably) user interface.
A citation is a citation. Just because I link to a site, it doesn't mean I link to it because I think their content is great. If your site is purely an "information site" (e.g. review site / people go there for user generated content), then perhaps links are more geared toward content. However, there are huge business areas of the web that are there to promote services and products (straight-up business sites) - citations of these sites are far more likely to be regarding the services and products they provide. Why does that citation have to only concern the content to be a good thing? Google see a citation from a trustworthy, authorative site as a good thing regardless of the intent, no? And when you search for a specific service or product, you're more likely to want the most recommended / reputable suppliers (in theory, anyway).