If you can't afford to lose your money then gambling is not place for you, while if you are only aiming to be entertain, you should use spare and keep it as for entertainment to avoid losing a lot.
Gamblers that are for entertainment should only spend the amount of money they can afford to lose.
That's all for them and they shouldn't go outside the budget that they have allotted for gambling if they don't want to be disappointed.
But many still goes more than the budget they allot for entertainment with gambling.