You are rewards based on the work you have done for the block found and it's duration.
I understand that but part but if my PC is putting out a consistent volume of work, it would seem like the reward would be more consistent. There are thousands of people in the pool. I would guess the average productivity per miner is realtively stable for a large pool, so I don't get why the reward varies so much between rounds.
Is a chunk of it just luck? For example, my PC gets lucky and finds the solution to several problems quickly during a round versus getting stuck a long time on a single problem?
