PoS difficulty is very low. Low diff is why even small transactions can make PoS blocks after very small amount of time, and the reward is minimal. Rounding was up to 2 decimals, rounding down. Super small rewards were below rounding and not paid.
- no more rounding starting from block 12500 [22.06.2013] - new awesome graphics made by 1Peter - first stage of reworking alerts system.