...
I apologise if my post was misleading, but the post refers to the "luck" of the pool, not individual miners - they are affected by their own variance (in finding shares) and the reward method variance.
Including luck and orphans, over the past year the pool as a whole has a profitability of
97.4%, and the CDF is
80.2% which is
not so unusual.
http://organofcorti.blogspot.com.au/2015/11/november-17th-2015-mining-pool.htmlooc? What you been drinking man?

It's 90.3% and a CDF of 99.9% ... reading from your image

... which is like ... woah who screwed up the luck there ...