I have about 620ghs in my account on pbmiming and I make about 0.532 Btc in a week.
however it will drop in every difficulty change..
Plannning on increasing it at next diff increase to 1ths.
but yeah about 0.08 btc a week for 100ghs

Customer # 3410   100ghs      0.08593750

The payouts have been fine so far on every sunday.