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No work can be done properly without skill. As mentioned earlier how to play blackjack and poker is not only a matter of chance but also of skill. Conscious people don't think of gambling as a way to make money but play for fun and with good luck it is possible to win. Remember although tricks can improve your odds blackjack is still a game of chance and the outcome is never guaranteed. The objective is to make informed decisions manage your bankroll responsibly and enjoy the game. By applying these principles you will increase your chances of winning.
You're wrong about blackjack, if the card counters knew that they're not going to make a guaranteed success when they're playing blackjack then they wouldn't waste their time doing card counting. There's a reason why casinos are scared of them that's why I disagree with the idea that card counting in blackjack is a game that won't just improve your chances but also not guarantee an outcome, you probably don't know how card counting works so you're saying this, I recommend that you watch the movie 21 or maybe some math channel in Youtube about card counting and you'd know that what you're saying isn't true.