I think in gambling there is no assurance that we will not going to lose money. If we really don't want to lose money then stop playing gambling. But of course it is a hard decision for those who are already addictive. But in my own opinion, there is no assurance that we will not lose money in terms of gambling.
In gambling, you have to expect the unexpected. You might earn a lot of money and lose a lot of money. There is really no guarantee but you have to limit yourself when it comes to gambling or just stop for a while when you already have enough profit.