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You`re right about new casinos. They try to get new gamblers with all kinds of rewards and it can be a good choice for bonus hunters, but the same time new casinos can be a scam. For gamblers, that wants just to gamble - old casinos with good reputation can be the better choice due to their account bounty program. For gamblers that want to play for a long time it can be better decision.
Anyway, we can`t change the casino politics, we can just choose the casino we like most than others.
New casinos that really wants to grow very fast need to adoption different method of complimenting their customers which will make some gamblers attract more friends and people that will love to try a new casino that has a good rewarding system for new and old users.
This time around some gamblers that have had really bad experience with new casinos that scam them will not want to use a casino without seeing how far they have been in existence and how good there reputable had been. All these are ways that keeps some casinos stay static and never grow as fast as possible.
They can use referral system and bonuses for account for long time gambling. And some gamblers can get good profit from inviting gamblers. The same time the casino get new gamblers. Such system ought to be more profitable than in other casino to attract new gamblers. And of course, such new casinos have to work hard with bugs and support gamblers to get positive feedback.