No, I don't read instructions and am going to ruin the survey results for everyone.

snicker

Also, wow, the population of Europe is wildly lower than I thought it was, it's outside my 90% range...

Random math: one way of deciding whether or not to cooperate in the reward question is plot reward versus percentage-UDT-users in the LW community (under the assumption that everyone in that set will do the same thing you do, and everyone else splits 50-50). If that percentage is larger than about 65% (which I'm 70% sure it is), cooperating is superior to defection, but defection actually has the higher maximum expected value - if the entire community chooses randomly, anyway.

...

blink blink

Aw, darn it, I should've flipped a coin...

Edit: No, wait, nevermind, that would halve my expected reward.