However, the point that measuring a person's activity (for no other purpose than just measuring it) increases the productivity against that measure. (For those of you at Nokia World, remember Dan Pink's presentation; if not, look it up on TED/YouTube).

Karma in and of itself has value in motivating people to get more of it (in general). So, in terms of picking a balance to decide who we want to reward we should ensure that it also highlights the areas we want people to contribute in.