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 $19.1K — a different platform, not this one.

Avadon 2: The Corruption

Avadon 2: The Corruption is a huge, indie fantasy role-playing adventure, the second chapter in the epic Avadon trilogy. You will serve the keep of Avadon, working as a spy and warrior to fight the enemies of your homeland. As a servant of the Black Fortress, your word is law. Experience an exciting fantasy role-playing adventure as you try to save your homeland from civil war and fiery destruction. Avadon 2: The Corruption is an epic fantasy role-playing adventure in an enormous and unique world. You can choose from five different character classes, each with dozens of unique spells and abilities. Explore cunning dungeons, hunt for hundreds of magical artifacts, and travel through an enormous world, full of secrets. Avadon 2 features many different endings. Save your people, or betray them. The choice is yours! Dozens of side quests, dungeons, and secrets to discover. An epic fantasy role-playing adventure in an enormous and unique world. Five different character classes, with dozens of unique spells and abilities. Uncover the fascinating histories of Avadon and the many lands of Lynaeus. Many different endings. Will you be loyal to Avadon or switch sides and bring it down? The choice is yours! Hundreds of magical items to find. Use powerful crystals to make your artifacts even more powerful. Huge adventure with lots of replay value. Experience with Avadon: The Black Fortress is entirely unnecessary to enjoy Avadon 2.