_after losing $20 you suddenly want to win it back, you should know you are stepping on the wrong road.
That is the gambling spirit. I don't really know why the thing is like that. When you loss money
there is another spirit would come tell you to play back and win the lost plus extra amount. ~
I know what you mean. This very spirit keeps visiting me from time to time

, and it's so hard to say no, I know. It's so hard to banish that spirit, but that's what we, gamblers, should be doing to avoid painful consequences of following it.
~ if you gamble for gain then that is where you would always enter problem.
Not
always, but there's a high probability of that. When we say "always" some people may argue that it's a fact that there are many cases of successful gambling by those who wanted to win a huge amount of money. And that's true. In the history of Powerball alone, 393 tickets have won jackpots, many millions of USD each. Also, it's true that people win millions of USD on online slots, but if we think we can be one of them just through being persistent, it only means we can't calculate probabilities properly.
It all depends on the character of the person. And also from his mental abilities. If a person is good at mathematics and knows something about probability theory, then he will certainly understand that the probability of winning in the long run is always much less than the probability of losing. But still, some people believe in their luck, in their good karma and play risky.
And of course he loses as a result. But sometimes it's not a disaster, but just a life experience and a great lesson for the future.