Of course everyone who gambles wants to win in the games they play, but it will be very different for those who can control themselves and can also manage their gambling time, for those who can do this of course they will not spend a lot of their money gambling and they have set a budget for gambling and can stop when they experience losses in their gambling.
This really depends on each individual controlling themselves well, but it is very difficult to be able to do this if we are in a game and almost lose, for some people who have become addicted to betting it will certainly be very difficult to control themselves. them when gambling.
Winning is the primary reason more than 80% of most gamblers gamble. Even those who gamble for fun actually drives the fun in their wins and not loss. But the challenge most persons usually have with their gambling habit has to be with controlling their selves well enough not to allow the habit turn out detrimental to them.
Like you rightly stated, it's more of an individually based decisions when it has to do with self restraining and control while actively gambling, most gamblers especially the average and newbie and sometimes even the experienced ones lack this quality and it has been a reason they have mostly lost so much already to gambling, if at some point they were able to apply some level of self restrain, maybe they would have been able to cut some losses just like those who do have this abilities does. Addiction actually has been one of the strongest drive against the ability of self restraint and until it's conquered most persons will not be able to self restrain.