I am not ashamed to admit that I have taken advantage of Steam sales and Humble Bundles to amass a library of roughly 150 games for a fraction of the retail price. I am, however, ashamed to admit that I've only actually played about one-third of them (and that's probably being generous). Apparently, I'm far from alone. According to Ars Technica, just shy of 37 percent of registered titles have never been played. The site figured out a way to measure both the sales and number of hours a game is played through Valve's digital store. That's a huge deal when you're talking about an industry that avoids giving out concrete numbers at all costs. While the method used for collecting the data is Steam-specific and won't work for the entire industry, it still provides valuable insight into one of the largest game retailers in the world.