In gambling, if you do not gamble with a specific budget, it will definitely become a big loss in the end.
It is more than just having a specific budget; a lot of discipline is also required. It will be very difficult for you to stay disciplined in gambling if you are an undisciplined person in real life because your natural behaviors will translate into how you gamble.
Gambling is an interesting thing, but here if you gamble abnormally and cannot keep any kind of limitation or control over yourself, then it is natural that your path will be wrong.
Some gamblers actually start gambling with a lot of control, but subsequently along the way, they tend to lose their discipline, and then they become victims, people who have helpless urge to gamble.
Sometimes these gamblers lose discipline maybe because of a traumatic experience which they took to gambling as a escape from, or perhaps they became too excited by gambling that they failed to remain conscious of their ways and call themselves to order.