On what Internet resources can I find out the specific profit from the sale of a computer game?

Question

Monetization

When completing the task at the course from Wargaming at the Universarium, I encountered an inability to determine how much profit this or that game brought. The information is needed to draw up a student concept document of the game, specifically to calculate the expected profit from the project.

Answer 1

1) steamspy.com
2) Choose 5 analogues
3) Calculate the average
4) multiply by some error, like 0.7