So I just added 10gh/s to my total setup, everything is reporting full hash on Slush's site but my estimated reward doesn't look bumped up much at all. Does this mean everyone else plugged in 10gh/s at the same time as me? Or did we get more members so proportionately I'm nearly unchanged? Or does the estimated reward need more time to catch up? Perhaps I was expecting to see more of a bump, I mean it's a little bit higher but not much.
The pool hash rate is changing all the time, but say it was 400TH/s when you plugged in (it's 422TH/s as I write this), and where in the round you connected affects the reward as well, but in terms of hashing power 10GH/s divided by 420TH/s times 100% = a relative increase of 0.0025% for the pool, so yeah, the reward bump wouldn't be a lot.