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When someone bets 600 into a 4000 pot, it is because they feel that this bet will maximize their profits. Most of the time they bet small amounts because they think the opponent has nothing and thats all he will pay off with A high or whatever. I doubt that reading this will help them as much as making better reads etc.

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Of course they feel this bet will maximize their profits. Rizen's point, which I think is one many people do need to hear, is that these players may have a good read on their opponent but dramatically underestimate the amount he will pay off on the river. If Villain is folding TPTK to a 3/4 pot bet on the river any time a flush card hits, then Hero probably needs to be bluffing the river a lot more often.