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 $8.8M — a different platform, not this one.

Brutal Legend

Multiplayer notice: The DRM free version of Brutal Legend is single-player only. The vivid and wildly creative world of Brütal Legend is brought to life through a spate of chrome, leather, rocker babes, epic music, fire-breathing/stud-wearing beasts, mountains made of guitar amps, and more. Follow Eddie as he embarks on a tour of epic destruction with an axe, a guitar, and his minions as he commands the power of rock in epic band battles. It’s lighter-flicking awesomeness that will melt your face clean off. Brütal Legend is an action-adventure that marries visceral action combat with open-world freedom. Set in a universe somewhere between Lord of the Rings and Spinal Tap, it’s a fresh take on the action/driving genre, which in this case is full of imitation cover bands, demons intent on enslaving humanity and Heavy metal tunes. Featuring the talents of comedian, actor and musician, Jack Black as super roadie Eddie Riggs, as well as cameos by some of the biggest names in metal music, it's a wild ride in the belly of the beast that is not to be missed! You have the freedom to walk, drive, or fly anywhere in a fully streaming open world whose art style is inspired by some of the most iconic and hilariously rad metal album covers ever created. Every vista in the beautiful universe of Brütal Legend looks like it was pulled from a Frank Frazetta painting. Fight alongside Metal Gods--such as Lemmy Kilmister, Rob Halford, Lita Ford, and many, many others--while rocking out to the most epic heavy metal soundtrack in video game history. Your guitar is your weapon. Wield a demon-slaying, electricity-creating guitar and use the power of Metal to summon wild beasts into battle, buff your teammates, and melt faces!