Well that's the addiction part. Techniques to avoid spending are just tools to make it harder so you won't bet hastily more then you can afford. I would say it starts from routine. Have a routine and never break it. If i break it i will give myself sanctions not to gamble x amount of time.
First step is to admit having a problem. As when gambling stops being just fun pastime it sounds like something is not ok. Some people can handle it some of the time and some people need to stay away from anything addictive, especially if there's a chance to lose everything.
Having a routine is a good tool for avoiding addiction and spending but I guess if that routinely doesn't include a total break from gambling at some point it will amount to a waste of time because as long as the gambler continues to seat on the game even though his budget has been reached, the urge will drag him back into making further top up to continue playing.
But if there is a total brake from the game once the limit is reached, this will help the player to adequately avoid all the urge thauchargese from the games which is the reason for the earlier dilation of the initial spending budget.