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 $18.3K — a different platform, not this one.

Eschalon: Book III

Eschalon: Book III brings the trilogy to a climactic end as you seek to uncover the mystery of your past, the secrets of the Crux stones, and who the Orakur really are. You’ll traverse miles of virtual wilderness and dungeons, filled with secrets and danger, in an unparalleled role-playing experience designed to feel like a true pen-and-paper RPG. Book III is not a dumbed-down “RPG for the masses”. Rapid button clicking won’t save you here. Eschalon pays honor to the greatest RPGs of the past, with unlimited character development options and freedom to explore the world as you wish. The difficulty of the game does not scale to your character. Dozens of fan-requested features and updates to the engine and rule set. Hundreds of graphic updates including re-rendered tiles, new spell effects, and enhanced environment effects. New sound effects and music in crystal-clear HD audio via an updated sound engine. Expanded stats for creatures give them new abilities, defenses and vulnerabilities. Combat will require new levels of strategy. New spells and hundreds of new items for you to discover. A huge world filled with secrets, riddles, traps, treasure, and glory awaits you!