"What happens when a subscriber-based massively multiplayer online (MMO) game suddenly switches to the free-to-play formula? Ask Turbine. The company saw a 500% increase in revenue after it made Dungeons & Dragons Online a free-to-play game. Turbine's other massively multiplayer project, Lord of the Rings Online, likewise switched to a free-to-play model in September, and its revenue has tripled since. "We are super-pleased with how so many of our.."