It is absolutely true that gambling can even ruin a person's life. 
But not all people are so gambling and reckless when they see that they are not succeeding in winning big money while playing, that they still retain the ability to stop in time and not continue playing.  But of course, some players can be said to simply lose their minds and control over their actions, and that moment when the adrenaline from the game rages in his blood and clouds his brain and the player stops thinking logically at all.  There really is a danger of developing a gambling addiction.  But it seems to me that a person with a sufficiently strong will and abilities of even average self-control is not very susceptible to such a development of events.  It seems to me that only one out of ten average gamblers can actually potentially become a gambling addict, and in the disease stage. 
Fortunately, most players still simply get emotions and pleasure from the games and this does not bring any negative consequences.  Well, of course, if you don’t count the lost money, which, as is commonly accepted, can be considered simply payment for the pleasure received from the game.