It exists. I won't link to it. (Also, few people are that good at multitasking.)
The point is that human values are complex. If you tell someone that donating money to the Society for Treating Rare Diseases in Cute Kittens is irrational, because they'll save more beings by helping to spawn a positive Singularity, you reduce the whole activity to helping beings. It's not just about helping beings, it is also about feeling good and helping certain beings in a certain way at a certain time.
The same can be said about lotteries. Playing the lottery is not something that can be optimized, because you don't care about that. You just want to ...
Today's post, New Improved Lottery was originally publeslished on April 13, 2007. A summary (from the LW wiki):
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