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I have seen many cases where the bets are very large and not all the time they win, many high rollers lose too, that It is normal, it is in the statistics, this is not technical, it is luck at 1000%, this is the great thing about gambling.
Gambling is unexpected luck that come from nowhere, you are right because no insurance or statistics that discuss and speak that when you bet in a larger form the case and opportunity of you winning is there.