My friend wants to promote his game on SG but failed the $100 requirements,can I help him to promote

Yeah im fully aware, that's when you copypaste the email and send towards next dev :)

Assuming that it only happens once, which rarely is the case.

Just tried to calculate it in my head but i suck xD

wrong. 50 copies of 10$ games will give 149,12720364$ CV. And next copy will be worth less than 9 cents :> Generally it is impossible to gain more than 150$ CV with 10$ game, because after 72 copies each additional copy will be worth less than 1 cent even if rounded thus will give 0.00CV ;) General rule - max CV that can be earned by giving away multicopies of game (for nonbundled games) Is few cents less than [Store Price]*15, no matter number of copies.