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Mate you can't compare an exchange with a bookie. Exchanges are a service and of course they charge fees.
Obviously betting is also a "service" but they make SO MUCH money off losing players, ripping people off when they withdraw is just pathetic.
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Please try to understand this simple thing: casinos don't make money off losing players. Some people are losing big amounts while others, at the same time, are winning big amounts. From 90%(some slots) up to 99.5%(Blackjack) of the money lost on a platform goes not to casino but to the winning players, and this is how it works, a casino makes money from the house edge, not from the losses on their platform.
No I disagree with you Betwrong, Maasdamer is not talking about casinos and gambling games, he's talking about bookies. And he's right, most of sportsbooks don't offer mutual betting, odds are set by bookmakers on the base of the probability of outcomes to occur and few other things. So when most of punters bet on the wrong outcome, the money doesn't go to the winners, they only receive the payment agreed upon at the time of the bet.
And I disagree with you, @Saint-loup.

What I said applies not only to all casinos, but, to a large extent, to bookies as well. Bookies aim to make stable income, they don't want to gamble, so they are adjusting the odds in accordance with how much money were placed on this or that outcome. I know that odds are fixed on Stake(and other bookies you are talking about), and they are not fixed in the case of pure pari-mutuel betting, but let me tell you this, if, for whatever reason, a big amount was placed on the underdog, the odds for the underdog would drop immediately on that platform, as well as they would rise for the opponent. This way bookies are trying to minimize the risk of losing big money. Bookies don't want to gamble themselves, they are business people, not gamblers after all.