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It is more profitable to extend the enjoyment, as each add-on, even if it doesn't offer much new, will cost as much as a full game. Take, for example, "Crossworlds": due to clever advertising, it seemed like a truly significant add-on with new campaigns, units, and gameplay elements. Everyone thought so and bought the game. But it turned out to be just a patch for the previous game, essentially. A high-quality one, but still a patch.