Because it varies and changes all the time.
The only way for a set reward is with a PPS pool but there isn't a DGC PPS pool yet.
PPS = Pay Per share
ahh ok, so in answer to my question posed 5 or 6 posts ago... then a PPS pool is what i'm looking for, for someone who can't run a dedicated mining rig?
i understand the inherent varience with thse things, they're based on probability, but my point is that it seems also inherent to these systems that if i can run a dedicated mining rig, then my profits per hour are much much higher, than if i run for 10 hours, then stop for 4, then resume mining.
this is the crux of my inquiry