Good point about the average.
However, when you factor in the additional variance introduced by high share difficulty and reject rate, and you get more variance than you would elsewhere.
Yes?
M
P2Pool definitely has more variance than other pools; I'm not sure if it makes sense to say that difficulty changes contribute to P2Pool's variance more than they do to other pools (but I wouldn't be surprised if that were somehow true...)
Difficulty changes definitely effectively "magnify" past variance relative to current earnings, at least.