I think that controlling emotions is very difficult even in normal situations when you are not winning,when you win it becomes even more difficult as the momental joy of winning makes you asking for more and this is the hardest thing to fight because our human nature is deeply based on greed,we want always more and more and that is what lead to gambling management as an almost impossible task for at least 90% of all the gamblers.
It means they didn't get paid enough from their jobs, so they choose to gamble in order to earn more. So the problem is they need to find other jobs that pays well or part time jobs, until they feel enough. When they didn't desperately to earn money, they will able to control their emotions.
The main problem of gambling addiction is money, we make money from working, not gamble.
That's not a good plan to gamble because of they want to earn extras money, gamble isn't a job for anyone except the director of the company. Gamble have a specific period that it helps the gambler. In 7 days a week you might win only ones or twice a week but the rest days will be very tough for the gambler. A gambler who gambles to earn extra money can not be satisfied with any amount they win unless they win millions but many gamblers will not stop to gamble and they will lose half of the money they win or all of them.