I defected, for similar reasons (without having read the comments, I just assumed that I'd be likely to prefer funds to whoever volunteered to fund this than to a random survey-taker, particularly weighted towards a survey-taker who defected). I'm afraid Yvain's answer here would not be enough to get me to switch.

If the rest of the $60 prize was to be burned -- effectively a wealth redistribution among capital holders -- I'd cooperate.