Not true my friend, I know a lot of gamblers who actually took the advantage of gaining extra profit just by gambling, it is facts and its just the matter of putting luck in the games that you play, it is hard and once you get addicted to it you cannot stop until you had no more money, but I don't think that all gamblers will lose, some gamblers find this just a source of entertainment but for some gamblers they need to make profit and have set their goals over the casino.
It depends upon person to person. Some people win and earn good in gambling while other just lose their money. Everyone come to play gambling but not everyone can win. If everyone starting wining, then how will the casino will earn ? So, its everyone luck on how they go about this and Win or lose.
But still, if we can count that the winning gamblers are too few compared to the losing gamblers because gamblers who can win, he has great luck. And if we compare between the amount of money that gamblers can win, it still bigger the casino or the house than them, so the casino still takes benefits from the gamblers. And it means, nobody can win in gambling against the casino.
Purpose of gambling is not to win. House always wins, they even tell you that, they literally tell you they will take your money. Purpose of gambling is to have fun and entertainment, look at casinos in Las Vegas, they have big huge shows there, concerts, stand ups, box matches and everything of the sorts right there because they tend to be the most entertaining place on earth.
If you want to have fun and have money than you go to Las Vegas and have a crazy weekend and have the time of your life, you do not go to Vegas to try and win money from them, that is not how casino and gambling business works. Sportsbooks of course offer much better odds but they still have a hidden odds and they do make money from odd bad team winning type deals.
All you have to do is sit down and try to see what they offer aside from just gambling and you will realize there is much more to it than just rolling a dice.