There is a reason why a gambler is called an addict first once a gambler can not control himself or herself to play because of greediness and aiming for revenge for his/her losses. And what we saw in our society right now some of the gambler spend more time in gambling than their job, so they called a gambling addict.  Spending money in gambling machines has a good percent of winning so without a doubt those gambler get addicted these kind of game.