The "luck" of btcguild has been:
Luck this difficulty (1690906) 1937899 shares (-12.7%) (weighted down 54% since in progress = -6.9%)
Luck at difficulty 1563027 1690231 shares (-7.5%)
Luck at difficulty 1379223 1384144 shares (-0.4%)
Luck at difficulty 876954 875473 shares (+0.2%)
Given the hashrate > 2 Th/s, being consistently low on luck makes me think something is up. I understand probability, and the fact that there are up days and down days, but this shows a 2 month average of -5.4%. This should be extremely unlikely, and makes me wonder if BTC Guild isn't holding back a good percent. Any math majors out there want to calculate the probability?
I think the -7.5% is not real because it includes the DDOS attack time.
I actually suspect that sometimes something happens during the server changes because we always seem to get bad luck when one occurs, but I dont suspect eulethria honesty (hopefully I wont have to eat my words).