I have been charting data for the network and for many pools for almost two years. The data is not pareto distributed, rather the average "luck" per n rounds is erlang distributed. PM me of you want more details, otherwise check out http://organofcorti.blogspot.com.au/search/label/weeklypoolstatistics.
Do you have data showing luck by week? The more I watch these data, the more I don't think luck reverts to a mean.