A5s in blind battle.

[sledghammer]

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Obviously, your stack as a whole does gain utility from an early double-up, but it's less than double the utility of your original stack. If you're only 0.1% EV+ to double-up you are overpaying for the expected utility gained.

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It doesn't matter if it is worth less than double your original stack. Just as in a rebuy, spending extra for double the stack can lower your roi and still be +$EV.