[bilbo-san]

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Hero has invested $3 into this pot with a marginal hands. Hero has to pay $65.50 to find out if his hand is good. Pot size is $7.50 - for all those who call can you see why this is wrong?

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Explain why the pot size is $7.50. I count $73.

Then explain why the [censored] the fact that "so far you've invested $3" is relevant. Equity is equity, and sunk costs don't matter. You'd make a poor economist. Both monetarily and qualitatively.