ROI of Gamification

A simple but still  incomplete view of the ROI of gamification.  The same approach can be seen for many kinds of applications.      " ... Measuring ROI is an elusive task: you have external factors that affect the results; measuring the baseline is a subjective process; forecasting future impact is hard and even calculating the actual investment is a project by itself. ... "   I see that the GCO site that this is on is itself 'gamified', which is appropriate, but is also annoying.  The value also needs to first rise above that level of annoyance.