The link under fee changes does not work.
Otherwise this seems like an interesting summary. I've been thinking of making a similar post with my experience on PredictionBook, but you've been a lot more systematic about your predictions.
Many of the links in the OP that are supposed to go to gwern.net instead go to non-existent pages on lesswrong.com.
This essay exists as a large section of my page on predictions markets on
gwern.net: http://www.gwern.net/Prediction%20markets#1001-predictionbook-nights