If you made a great living as a truck driver you would likely find yourself hard pressed to care about delivering cargo in a video game simulation.

The vast majority of players of American Truck Simulator are not professional truck drivers. There is very little appeal to playing a game that simulates your job, so most truck drivers chose other forms of entertainment than truck simulator games. This is not because of the payscale.

It takes about 8 hours to drive 500 miles. Spending 8 hours maintaining lane position is not very engaging. No amount of money will make 8 hours of lanekeeping exciting or engaging.