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 $19.6K — a different platform, not this one.

18 Wheels of Steel: Extreme Trucker

You ‘da Boss! Move it better and faster while staying alive. Build your reputation and your empire in the far corners of the world as you haul across the most extreme conditions and loads. Grab the wheel and hop in – is your heart pounding yet? Haul extreme cargo - from diamonds to oil pipes - across 3 death-defying terrains. Throw your weight around - jump behind the wheel of over 25+ unique rigs and 30+ types of loads. Extreme Caution - Feel the power and adrenaline of driving terrains that no sane trucker would take on. Extreme Locations! Travel across 3 hair-raising terrains including ice, dry desert and gnarly jungle. Your life is on the line! Drive terrains that don’t forgive your mistakes - do the job well or you might die trying. Extreme Loads! Transport loads that would even scare your grandma - maximum/minimum loads, oversized loads, high risk cargo and more! These beasts don’t drive themselves! Back up to loading docks, manage your fuel, and maintain your trucks in peak condition. Extreme Deadlines! Achieve the unachievable by delivering your loads under deadline.