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Indeed, many rich people play just for fun, for the ability to assess risks, for example, the same poker. Many rich people love poker, even if they play with professionals who beat them in the long run. So businessmen try to read hidden tells, to understand whether the player who puts all-in against him is bluffing. In addition, poker has a mathematical component, as well as calculating the odds of the bank. I myself like poker for this very reason, and from the point of view of earning there, I do not really consider it because I know how hard it is to earn money in poker, you need to completely live this game and devote a lot of time to it.
Of course they play for fun, most of the games they choose can make them more relaxed and not rush to conclusions. Rich people play by instinct and reading their opponents' moves when raising the stakes, the resources they have allow them to turn things around even if they lose in some rounds.
At certain times this type of game also requires doing something beyond reason, such as placing an all-in bet when getting good cards. Bluffing like this can affect the opponent's mentality and they have to think again if they want to continue the game. Rich people are not infallible, the capital they have allows them to take back their money if they are able to read the hidden signs.