That is the essence of gambling that really made many stays and play even turning into addicted, the Belief that Gambling will bring them fast money.
But if you dig deeper and understand the real concept of gambling ? it is created just for enjoyment but of course the ending brings sudden when there comes many addicted than playing to have fun.
the gambling site may bring big profit or winning from the beginning but in the end? makes you lose more than what you desire to take.
For the casino owners it is just pure business and a way for them to get good profits for their business since gamblers eventually end up losing all their money.
Gamblers get a false hope that their next bet will be a win and get them profits. While this does happen a few times but most of the times it is the opposite.
The addiction is obvious because the greed increases in gamblers making them place frequent bets.
You are right that gambling is just meant for enjoyment but at the same time gamblers should consider the amount needed for that sense of enjoyment.
They should keep a budget for their gambling needs and only play within their capacity to lose.