Hi, I was all in for the past few days to try 256 difficulty but something just occurred to me.
It doesnt matter if we go 32, 512 or 1024 for the global profit, if someone is about to find a block he will do it regardless of the share diff. Changing share diff wont increase the pool profit imo.
We can still speculate if the 512 is making old rigs fall behind and the 7xxx rigs may be indeed chewing income from those rigs, but the only way to know for sure would be to compare % of reject Mhash or daily payouts per acceppted average Mhash.
Your missing the entire purpose of share difficulty. If you do not submit a share, before the block is found, you do not get paid. That is what people are saying about share diff. It may not affect the pools profit, as a whole, but it will affect individual profit of the members, with in the pool. Again, this is why VARDIFF exists, to begin with. Those with the cards that can submit the shares fast enough, for those 20 or 30 second block coins, get a higher diff, with shares that carry more weight in the payout, because they submit shares less often, slower cards, get lower share diff, that pay less, because shares are submitted more often. Everybody wins