Actually, we know about the risk, but we forget it after enjoying the game, which makes us spend more money and lose more. Before we gamble, we must have control over ourselves to control when the situation is not right for us. We will become rush in playing gambling, especially if we know that we already lose some money, which can make us drag inside the gambling.
one thing is knowing with our heads
a totally different thing is applying what we know.
if one has difficulty to control their emotions the best would be separating a fixed amount of money, preferentially no more than 1% of total money that they'd be willing to lose and would be fine with.