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 $165K — a different platform, not this one.

Avernum 3: Ruined World

The conclusion to our hit indie fantasy trilogy! Avernum 3: Ruined World is an epic, indie fantasy role-playing adventure with many hours of gameplay. Explore an enormous world that evolves as time passes. Towns are destroyed. Refugees flee. Disasters happen. Your people long to escape from their underworld prison, but the surface world is being destroyed. Fight plagues of bizarre monsters and win your freedom. Enjoy an intricate tactical battle system with multitudes of abilities, character traits, and unique magical artifacts. The story of Avernum 3 is self-contained, and previous experience with Avernum games isn't required. Epic fantasy adventure with over 60 hours of gameplay. Explore an enormous underworld and a huge surface continent. Rich game system with over 60 spells and battle disciplines and a multitude of beneficial character traits to choose from. Well over 100 towns and dungeons, which change as time passes. Cities crumble as the monster plagues advance. Fight to save the world. Or don’t! Do odd jobs. Be a bounty hunter or merchant. Buy a house. Unique races and settings make Avernum different from any adventure out there. Over 100 side quests and hundreds of magical artifacts.