why is this weeks payment are lower than last week?
and i do not see any difficulty increase between the period 09/11/2014 and 16/11/2014
so payments must be the same, or greater than last week(in case a purchase of new contract in the middle of the week)
Just a guess here, but the payout seemed earlier to me. That could be it.
This, plus there was difficulty increase last week, so part of the last week mining was with lower difficulty (thus higher last week payout)