Ah, ok. For EU you care about the actual difference in probability, whereas for strength of evidence you care about the amount of information you would have to receive in order to change your credence that much, and this is compressed near the ends of the probability range.

Edit: What was your question again? At first I thought that you did not understand what you were talking about, and thought that your answer re the context would be a link or quote where somebody else brought it up. But what you gave me is almost a set of proofs, and the explanation is clear from your use of dB in the evidence/information case.