I've played with the gambling capital of 0.15 BTC . all gone in one day. I wondered why I did not stop when the money I left 50% of the total. but I knew it was a risk in gambling. I still like gambling regardless of the outcome it 
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And that is what most people addicted to gambling think. They do not care about the outcome even if they lose I guess if you play for fun it does not hurt. But people who gamble to save their lives should not be thinking that. .