Ars Technica
introduces Steam Gauge, where they go all grognard on the topic of game
sales on Valve's service based on publically available data. It's very lengthy
and detailed, and draws some interesting conclusions about the most owned games
on the service (
Dota 2 is number one), most played games on Steam
(ditto), and more. Perhaps the most interesting statistic they present is "that
about 37 percent of the roughly 781 million games registered to various Steam
accounts haven’t even been loaded a single time.