how different is that from litecoinpool's 3%? do you find as many blocks as LTCP?
the amount of blocks found is related to the hasrate the pool has. Of course if you are on a bigger pool you are finding more blocks than a pol with lower hashrate. But your income should nearly be he same as you are getting a "bigger piece" of the block on small pools.
(you are getting more often little amounts on big pools,thus fewer but bigger amounts on little ones)
So it should be equal in wich pool you are mining if the have the same fee.
(hope that is right mostly, I am not that expert though!)
