bitminter is a low fee merged mine PPLNS pool, on paper looks good, but somehow, their 'luck' is extremely rotten - just check the income section and look at CDF. Check the luck and reward section too.
And check the last pages of
this thread too

The rewards graph shows the last 500 shifts, that's currently the last 16 days. First 8 days are about average, some lucky, some not, and the last 3 were pretty unlucky. Now people are saying we didn't have one lucky day for an entire year.
Didn't have the data to do the match yet, but I doubt the rotten luck is explained by probabilities alone, likely a bug somewhere.
If you actually have a reason to believe something is wrong, please let me know what leads you to believe that.
When there is some good luck "BitMinter is a very profitable place to mine" and when there is some bad luck "there must be a bug causing that". I've heard both of those a few times before.
