Over 5 million people have signed up to Path of Exile. "Roughly" 1.2 million people are expected to play its next expansion during the month of its release, Chris Wilson, managing director of Grinding Gear Games, its developer, tells Gamasutra.
The game -- a Diablo-esque dungeon crawler -- is completely free-to-play. Its microtransactions are entirely cosmetic and have no effect on the gameplay -- and its gameplay is tuned like a premium game, with no stopgaps or gates. Yet its developers are wildly successful.
How does that work?