I'm trying poolmining ob btc-guild with the cgminer and try to calculate by testing if it is worth it or not.
One thing I wondered is: Why should I want to set a high difficult / not the lowest one, when mining?
If I am paid for the last N shared within a shift, I would want to contribute as many shares as possible. The lower the difficulty is the higher is the amount of shares, isn't it?
With about 170MH/s I have about 90 shares per hour.