Sometimes, the amount we spend on things that don't add anything to us is always more than the amount we spend on gambling and for gambling expenses, it's even better because there's a chance that you might win and get a return from what you've put into it but for the regular expenses, once it's gone it's gone for good and it's easy to spend so much on small items without even knowing that a lot is already going into such as long as you're not taking record of such expenses.
This does make alot of sense. Basically if you fail to control the way you spend on rather your budget on other reoccurring expenses as the day goes by then there is a higher chance that you will also fail in being able to account for your gambling expenses. When people talk about controlling your gambling budget it is not necessary a scenario where you take a pen and paper everyday and calculate the how much you are risking and how much you will risk in subsequent games.
Basically what it means is being able to keep track of what you are putting in and what you are getting out. This is where addiction has a lower chance on a gambler.