It's very important for our future as we cannot be certain of what will happen in the future, we should allocate funds for emergency situation in life
and of course an amount that we can use for leisure and investing in order to grow our money.
People with family and other responsibilities should always be careful with money being invested in gambling related activities. The monthly earnings should be allocated for different purposes. Personally, I do not spend more than 10% of my monthly earnings on gambling related activities and I am still single. The people who have just started to gamble should be more cautious as it could be very tempting with initial wins.
I think, that is the right guidance. Also, just because you are single does not mean it is right to think that you have a window for gambling. Even ten percent of your earning should not be wasted away. You appear to me a sensible person with some serious aim of life. Gambling is not a good game in every sense.