You can copy and use this from GameDiscoverCo to forecast how much money your game will potentially generate based on a number of wishlists you currently have on Steam.
Link: https://docs.google.com/spreadsheets/d/11tNEABOKuJxX9kTLJ08DyEMf1UC3cbLdejRtmjgLBDI/edit?gid=0#gid=0
Link: https://docs.google.com/spreadsheets/d/11tNEABOKuJxX9kTLJ08DyEMf1UC3cbLdejRtmjgLBDI/edit?gid=0#gid=0