Assume all guys here are gamblers. So, no people can have moral advantage than others. No Judge.
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Although everything is an assumption, the adjective "assumed" leaves you with the advantage that if it is not true; what is not true?, what you leave in the assumption "that everyone here is bettors" because if so, and it is, I affirm it, not everyone here makes bets.
On the other hand, the moral issue leaves me in a dilemma, since any genuine bettor doesn't give a damn what a third party thinks, and even less from a moral point of view, in general, the genuine bettor are interested in probabilities. Then, his common sense is the main guide of that moral fact.
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The moral aspect does not only include a vice like betting includes life itself, so if someone makes a bet, they do not immoral, it makes him immoral if that money that he bets, even if it brings him fortune, is money that he cannot afford to lose.
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Any profession that does not qualify as routine, or rather, one that does not guarantee a fixed monthly income, enters the phase of what you call success and failure, that is, your question success or failure also fits very well.
So how to measure that, success or failure, a life variable regardless of what profession you work in, is always there, like the temperature +38°c failure, -37.5 °c success.
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You have been betting for 15 years, according to what I read, where you are today is determined by your mental, economic, social, family well-being, etc., not by the moral judgment of a third party, and/or not consequently referring to a simple result of winning or losing.
---:those three dashes means that each of these paragraphs could have been a single post, but if you understand them as a whole it would be fine.