I do think that gamblers who take gambling activities seriously have their motivation come from the amount they envision and hope to win, hence why they remain persistent in gambling instead of quitting after winning a little.
A gambler with a winning amount in mind, gambles much more and can become easily addicted than a gambler just gambling for fun and without a particular winning amount in mind
The issue is not about having target, is keeping to that target. Most people before going into gambling in their gamble section they usually have this fixed amount they can win and amount they would love to win in that section. But most when they are lucky and they endup winning greed always comes in , and they will endup losing more than that target or they may lose that they have won during that section, all because of greed that's why self-control is one of the vital attribute one need have when it comes to gambling.