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whpearson comments on The prior of a hypothesis does not depend on its complexity - Less Wrong
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Can you elaborate on how it might defuse Pascal's Mugging? It seems the problem there is that, no matter how low your prior, the mugger can just increase the number of victims until the expected utility of paying up overwhelms that of not paying. Hypothesis complexity doesn't seem to play in, and even if I were using it to assign a low prior, this could still be overcome.
That said, any solution to the problem (Robin's of course being a good start) is more than welcome.
Pascal's mugging shouldn't come into it if you are using the universal prior. Or at least following an AIXI-ish version. Because AIXI does not intrinsically allow people to tell it the utility of actions, it figures them out for itself empirically. It treats the utility as another part of the world it is trying to predict.