Experienced gamblers are not trying to make money from it, there are many examples even among celebrities who bet just for fun, not trying to make money from it. Moreover, many of them have already made a fortune and that is why gambling, whether it is ordinary bets, or some games - for them just entertainment. But those who are trying to make money at it I think will never be able to do it
Yes, some persons (celebrities or rich dudes) take gambling as nothing very serious or not even close to what they can compare as a source of income because they already made a fortune from another source of income. They use gambling for fun and even if they are gambling to make profit, they are not completely relying on gambling as a source of income but many gamblers are making this mistake, they see gambling as something that they can easily get quick money from.