Yes there will be the right time that even those undetermined gamblers doesn't want to quit gambling for good. There would be the day that they will realize that they should end their gambling career. Remember in this world, that there will be always an end. And it will happen suddenly even they don't expect it to happen.
Gambling career? you must be joking when you say this thing. Not everyone are meant to get money from gambling that is a fact so either you win or lose and it is part of it. If you think that gambling harm yourself then simply quit as it is easy to quit, all you need is to have a self determination that you really want to quit
The only certain for a gambler to quit gambling is just if they loss all their money in the pocket and no penny to use on gambling, Once a person become a gambler the chance of quitting it is very small or impossible because it is already in their mind, So even if you have a limitation and goal but once you are on your bad mood, You can't control yourself to stop the urge of gambling even if you are on the middle of the night as long as you have money on your pocket that can easily use on gambling.