Why to mine with a high difficult on PPLNS 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.
The server will reject all shares that are below the difficulty it specified in your getwork request.

Reasons for the server to lower the difficulty of accepted shares:


Less variance for users


Reasons for the server to raise the difficulty of accepted shares:


Lowers bandwidth usage


Something from 4 to 10000 is about right.