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thomblake comments on Bayes' Theorem Illustrated (My Way) - Less Wrong
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If your utility function's goal is to get the most accurate hypothesis (not act on it) sure. Otherwise, why waste its time testing something that it already believes is true? If your goal is to get the highest "utility" as possible, then wasting time or resources, no matter how small, is inefficient. This means that your moving the blame off the bayesian end and to the "utility function", but its still a problem.
Because it might be false. If your utility function requires you to collect green cheese, and so you want to make a plan to go to the moon to collect the green cheese, you should know how much you'll have to spend getting to the moon, and what the moon is actually made of. And so it is written, "If you fail to achieve a correct answer, it is futile to protest that you acted with propriety."