Most analytics focuses on snapshot style reporting "how many events of type X, Y and Z happened this month?". This type of reporting is great for monitoring trends but it is impossible to calculate return on investment because it does not account for the lag time between customer acquisition and revenue generation.
Listen provides sales funnel style reporting because it is the only way to report accurate return on investment figures; monitoring the later actions of a set of people to attribute a real value against their initial cost of acquisition.
A snapshot report would tell you what you spent on acquisition in January (cost C) and compare that to what you made in January (value D), but the value D is not directly related to your spending on acquisition so you cannot measure return on your investment C.
A sales funnel report would tell you "for those people who were referred by our pay-per-click scheme in January (at cost A), how many went on to buy (for value B)". Compare A to B to measure return on investment.
Find out more about accurate return on investment reporting in our tutorial: