Re: [10000Th] Eligius: 0% Fee BTC, 105% PPS NMC, No registration, CPPSRB
In BTC Guild the shifts mean that you'd need to look across all shifts in the payout to make any use of the luck % (being inverted from share %) and invert it then avg it then invert it again ... to get a number that is related ... so yeah almost no one does that in their head 
BTC Guild's luck % is actually based on overall shift luck, I don't even track per-block luck (nor do I have any implementation to do so). The payment per share for every share of a given shift compared to what you would earn under 2% PPS. There's no extra math involved.