A thought: if someone offered me a trillion dollars to kill a person, I would get trillion-dollar loan, invent brain-uploading and emulation technology with it, copy the person into the machine, and then kill them. To put that more simply: past a certain point, the idea of marginal value in a cost/benefit analysis breaks down, because the benefit "changes the game." (That is, creates a discontinuity in the valuation…
It's never clear to me why people answer thought experiments like this in this manner. The point of the question "would you kill someone for a trillion dollars" is to tease out an answer to an underlying philosophical question, such as, "is the act of killing as we know it a moral absolute wrong, or is it merely an act with great negative utility that can be compensated by sufficient positive utility?" Yes, there are…
The problem with that, of course, is that even within our species, we have many different (and mutually-exclusive!) utility functions; sociopaths, for example, calculate theirs noticeably differently. So, it still ends up turned into a problem of cultural meta-ethics. That is, it's no longer a matter of "who do we shun and revile?" but "how do we get along?" or perhaps "do we want to get along?" (Which brings me to this: http://lesswrong.com/lw/y4/three_worlds_collide_08/)