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army1987 comments on Raising the forecasting waterline (part 1) - Less Wrong
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It depends on whether you're using probabilities epistemically or instrumentally. Changing the probability of A from 90% to 95% doesn't affect your expected utility any more than changing it from 50% to 55%.
The change in expected utility given constant decisions is the same for any 5% change in probability regardless of where the baseline is for the change. However, that "given constant decisions" criterion may be less likely to hold for a change from 90-95% than it is for a change from 50-55%. If you have to choose whether to risk a negative consequence of not-A in exchange for some benefit, for example, then it matters whether the expected negative utility of not-A just fell by a tenth or by half.
Yeah, that's why I said "For most purposes".