I also see no important difference between classical and quantum Russian roulette, but I still don't think I understand how what you're saying about branches relates to that.
In any case, unless I've misunderstood Viliam's original comment, it seems like you and he are in agreement; his argument is meant as an anti-QI intuition pump and is really only directed at those who (unlike you, unless I'm confused) endorse QI.
On a second thought I too couldn't find any possible difference between quantum and classical roulette, if your preference is not shifted by the measure of the branches where you're not dead.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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