Interesting.
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The entire group benefits monetarily if there are decisive games.
"... peer pressure was upon us all: don’t show your face in the analysis room if you drew!"
http://main.uschess.org/content/view/11239/632/
If the prize is known beforehand, it becomes one more cost/benefit calculation for the players to figure out. Without actually knowing the total prize fund I speculate the bonus was not insignificant.