After they have won and latter suffer a loss, you get to see that what follows next is them beginning to loose discipline and with time they move into addiction from something they Intended for just entertainment initially.
We have the choice to be in control or act out of control when gambling but it's better we decide to be in control because that's only when we can enjoy gambling. Gamblers are irresponsible and act out of not thinking and that's the similarities between most gamblers. They aren't supposed to behave like that but the spirit of enjoying what they're doing make them to become a nuisance without knowing. Gamblers are indecisive with their decisions because they're confused on what to do or what not to do. They can't make one decision and go with that because they're always unsure of what they're doing but still won't stop.