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You are right, it's a gamble. I mean, it's not a real investment. It's like the card tricks on the street. You guess the right card the first time, you bet a little more again, you guessed it again, you think you can win even more, so you bet big... and bam... you lost it all.

You should never use money you can't afford to lose and be sensible about what you're investing or gambling with.