No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $36.1K — a different platform, not this one.

Warrior Kings

You are tasked with restoring the power of a kingdom to its former glory using innate cunning, military might and a fearsome will to win. Warrior Kings is an epic real-time strategy game that smashes the mold. Using true 3D, it propels you into a living, breathing, and fascinating medieval fantasy world. Now it's all in your hands! Build up your economic and military power base, research new technologies, and employ spies, mercenaries, priests and merchants to enhance your strength. Use real military formations and tactics to conquer on the battlefield. Master the skills of siege warfare and watch your troops sack mighty cities. Conduct a massive campaign through 22 extraordinary levels made up of over 80 unique quests.