The bank advantage is the difference between the total stake placed by the players and the winnings paid out. In other words, the bank advantage or edge is the expected loss of the players in relation to the stake. The counterpart to the bank advantage is the payout ratio. If you add the Payout ratio to the bank advantage, the result is always 100%.
A general statement about the amount of the bank advantage cannot be made at this point. This is simply because every Online Casino can theoretically set an individual bank advantage for each game. With the classic Games of chance such as Roulette or Blackjack, the bank advantage can usually be calculated well. In roulette, for example, the payout ratio is 97.3% on average. This means that the house advantage is correspondingly 2.7%. It is not for nothing that roulette is therefore also called "the fairest game of chance".
From the player's point of view, the bank advantage is of course not a good thing. Therefore, the iDEAL scenario is that there is no bank advantage at all. However, the bank advantage is essential for an online Casino or casino to remain viable in the long run. The bank advantage covers all costs that arise for the operation of the casino. This means in particular the costs for employees, technology and premises. Bonus offers in online casinos are also usually financed through the bank advantage.