Slovak to English Other Gaming/Video-games/E-sports

Reference sentence:
Pod pojmom herná istina sa rozumie rozdiel medzi prijatými vkladmi do hry a vyplatenými výhrami z hry na všetkých termináloch prevádzkovaných v určenom časovom období.

The term refers to the difference between the wager bet in the game (vklad do hry) and the winnings paid out from the game (výhra z hry). I have seen terms such as "game principal" and "gross wager", but cross=checking on Google do not show these results. By the same token, !game capital" (Spielkapital) seems to refer to what the bettor has available for betting, not the difference between wagers bet in and winnings paid out. Any suggestions.