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Stuart_Armstrong comments on Utility vs Probability: idea synthesis - Less Wrong
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Now that I've rested a bit, let me think about this properly. One reason I was wary of changing probability was because of all the related other probabilities - conditional probabilities, AND and OR expressions, and so on. Changing one probability would have to keep the rest consistent, while changing utility had consistency built in.
It feels like changing a prior might be equivalent. I'm not sure that there is any difference between changing a prior and changing the utility. But, again, there might be some consistency worries to think about - eg how do we change priors over correlations between events, and so on? It still seems that changing probability involves many choices while changing the utility doesn't (it seems equivalent with finding a Bayes factor that provides evidence for that specific event?)
I will think more.
The normal way of modifying a probability distribution to make X more likely is to increase the probability of each world where X is true, e.g. by doubling it. This is equivalent to observing evidence for X. It's also equivalent to your procedure for modifying utility functions.