How do online casinos make money?
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Online casinos make money through the house edge built into every game they offer. This is a mathematical advantage that ensures the casino retains a percentage of all bets placed over time, regardless of short-term swings in player results.
The house edge in practice
Each game has a different house edge. European roulette sits at 2.7%, blackjack with basic strategy can drop below 0.5%, and slots typically range from 2% to 10%. On any individual spin or hand a player might win significantly, but across millions of bets from thousands of players, the math reliably generates casino revenue.
Other revenue sources
Bonuses with wagering requirements mean many players never successfully withdraw bonus winnings, which keeps that money in casino revenue. High-volume players who deposit consistently are the backbone of casino profitability. Some casinos also earn a small margin on certain payment methods. The core principle is simple: volume amplifies even a tiny mathematical edge into significant profit.
Ben Barber got into the gambling industry through the poker rooms of London in the early 2000s. After building up a solid grounding in casino, sports betting and poker, he made the move to Malta where he spent close to a decade writing for some of the biggest affiliate networks in the region. A few years ago he relocated to Bali, which shifted his focus toward website strategy and affiliate marketing. The casino side never really left, though. He still writes reviews, how-to guides and in-depth pieces on everything from slots and live dealer tables to crypto casinos and sweepstakes sites. His approach is fact-first: help players understand how online gambling actually works before they deposit a cent.