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 $2.9M — a different platform, not this one.

Torchlight

Torchlight. A booming mining town that grew up around unbelievably rich veins of Ember, that rare ore with the power to enchant--or corrupt--everything it touches. It’s a powerful thing, and everyone knows power, well. Power can corrupt, too. You’ll set out into the nearby mountains and depths below to discover the full extent of Ember’s influence on the civilizations that have come before. Choose from among three character classes, and venture from the safety of the town of Torchlight into randomly generated dungeon levels, with a huge variety of creepy monsters, endless variations of loot to find, and quests to complete. The endless randomization ensures that you’ll never be playing the same game twice. A fun, crunchy action-RPG, this one game that oozes style, care, and polish out of every single pixel and is a definite must to pick up if you like RPGs or just having some mindless fun. Over 30 randomized levels! Monsters, treasures, puzzles, and items are also different each time you embark on an adventure. Choose a pet that will level up, fight by your side, and even take items back into town to sell them for you! Includes TorchED for you to make your own Torchlight set dungeons, mods, and much, much more!