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SforSingularity comments on Torture vs. Dust vs. the Presumptuous Philosopher: Anthropic Reasoning in UDT - Less Wrong
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To be honest, I am suspicious of both UDT and Modal Realism. I find that I simply do not care what happens in mathematically possible structures other than the world I am actually in; in a sense this validates Wei's claim that
since I do not care what happens in mathematically possible structures that are incompatible with what I have already observed about the real world around me, I may as well have updated on my own existence in this world anyway.
In the case where either theory T1 or T2 is true, I care about whichever world is actually real, so my intuition is that we should pay the $1, which causes me to believe that I implicitly reject SIA.
Of course from a physical point of view, (e.g. from the point of view of Many Worlds QM or the lower Tegmark levels) there are lots of human instances around in the multiverse, all thinking that their particular bit of the multiverse is "real". Clearly, they cannot all be right. This is somewhat worrying; naive ideas about our little part of the universe being real, and the rest imaginary, are probably a "confusion", so we end up (as Wei D says) having to turn our old-fashioned epistemological intuitions into ethical principles; principles such as "I only care about the world that I am actually in", or we have to leave ourselves open to turning into madmen who do bizarre things to themselves for expected reward in other possible universes.
And formalizing "the universe I am actually in" may not be easy; unless we are omniscient, we cannot have enough data to pin down where exactly in the multiverse we are.