A very common desire is to be more prosperous than one's peers. It's not clear to me that there is some "real" goal that this serves (for an individual) -- it could be literally a primary goal. If that's the case, then we already have a problem: two people in a peer group cannot both get all they want if both want to have more than any other. I can't think of any satisfactory solution to this. Now, one might say, "well, if they'd grown up farther together this would be solvable", but I don't see any reason that should be true. People don't necessarily grow more altruistic as they "grow up", so it seems that there might well be no CEV to arrive at. I think, actually, a weaker version of the UFAI problem exists here: sure, humans are more similar to each other than UFAI's need be to each other, but they still seem fundamentally different in goal systems and ethical views, in many respects.