People don't have statistics to play gamble and that is why some of the gambling enthusiasm do experience (shege in gambling... meaning much loses in a gambling) so it's good for gamblers to know a specific amount that should go out in their wallet weekly or monthly..
In gambling, there are two types of people one who plays just to spend some time and for fun and the 2nd one does gambling to make money. The first one is very because they spend money to have some fun they do not care about the loss or profit but the second one play every day to make money and they do not tolerate the loss as they do a high bit and when they lose they are very disturbed. So for those people, I think the chart is necessary every day week, or month how much they need to spend on gambling how much loss they can afford, and how much profit they need to make the effort. If they set these few things they will not fall in loss or loans and will get their profit easily.
You are very much acquainted with the topic under discussion. There are some kind of casual gamblers who do not take gambling as a source of income, rather they just have some fun and try their luck with some spare cash with them. But there is another set of people, who claim that they are professional gamblers(if such a word exists). This people are heavily involved in gambling as they take it as a business, which means they will need to re-evaluate themselves whether they are making profits or losses on the long run. These set of people are the ones that are easy addicted. They have the ability to chase losses to the later.
The advice of having weekly, bi-weekly or monthly gambling budget is strictly for these set serious gamblers and unfortunately these people do not have gambling budgets and if they do they do not obey it.