If you don't understand "pool luck" and you don't want to learn about it, please stop mentioning it.
...... if somebody with less knowledge/experience than you, or I for that matter, were researching which pool to join and came across that luck graph - they would definitely have second thoughts about joining that pool - rightly or wrongly and for what ever reason. Maybe calling it a "luck" graph is a little misleading to some people, but not me. I understand it completely, and am not sure what made you presume I didn't. Given the choice between a pool who's "luck" was steady/rising and a pool who's "luck" was on a 60 day permanent decline - and still falling - what pool would the average potential miner choose do you think? My answer was from a general point of view, not mine and mine alone, as the question was a general question.
I'm sorry if my answer has offended anyone, that was never my intention. Graphs are there to provide information, aid research, help people decide what pools to join and aid in eliminating problems. If you believe everything is hunky dory with that graph, that's fine, but I can assure you that many more people will be put off by it, rightly or wrongly. That was my point.
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tl;dr: unless you have some way of assessing luck, don't worry about it. It's unlikely to ever be abnormal, and if you think it is let me know and I'll usually be able to give you an idea of how unusual the unlucky streak is.
I understand why you think that the graphs are showing something they aren't. There are ways to provide a "luck chart" that is menaingful even if you don't understand "luck", for example:
Shares per round / difficulty is a measure of luck - the higher it is, the less was earned and luck is worse. I think the p2Pool luck charts are 1/(Shares per round / difficulty)*100 to make it a bit more intuitive.
On the chart, the jagged line is the cumulative mean of (Shares per round / difficulty). As long as the line is in the shaded area, the shares per round / difficulty is within a 95% confidence interval for the data, and luck is in the expected range.
I'm not going to post an up to date chart right now, but the line is certainly in the shaded area.
As for
Given the choice between a pool who's "luck" was steady/rising and a pool who's "luck" was on a 60 day permanent decline - and still falling - what pool would the average potential miner choose do you think?
There are lots of pools with luck tending up or down. It's normal for pools as long as it's in an appropriate range. It's something you just have to accept about mining - luck will go up and down, and very rarely will it be outside of a normal range.
Another chart:
The dots are a measure of the weekly average luck. Higher dots are worse luck, lower dots are better luck. BitcoinPool for example has had abysmal luck. p2Pools luck doesn't look unusual.