Kaushik says that this kind of report provides two crucial types of visitor analysis: "Sources
of traffic, and hence just a hint of customer intent," and "Outcomes" (or the impact of the site on user activity, the industry and the world).
Knowing where your visitors come from can shed light on underdeveloped marketing channels (like Wikipedia or Stumbleupon), as well as which ones are your top drivers. Knowing what happens after users visit your site (whether they signed up for a newsletter, bought something, or bounced into oblivion) also yields insight into which features may need tweaking, or are working very well.