3D graphics nowadays requires fairly high precision to look good... (image from http://www.steampowered.com/status/survey.html)
So, when did it become possible to have a percentage of respondants to a survey greater than 100%? Is Valve pulling additional surveys out of their asses, or are they just turning the knob on the head of their mascot and getting their figures that way? Or is it possible that their webmaven was figuring out the math for Source? The world may never know, but at least some of us can count.