We're pretty much at the point now where expensive single-purchase PC games are rare remnants of a crumbling retail distribution business model. The free-to-play model is the norm for online shooters and MMOs, and most independently produced titles are sold for 10 USD or less. These days when figuring out what to play next, you're deciding where to spend your time instead of where to spend money. And even if you do decide to spend cash, you have plenty of control over how much...