Just as a newbie matter of interest, how is it that it takes 100 confirmations to get into ones account, but from the instigation of the transfer to your wallet, it only takes minutes - surely, then payout has to go through the blockchain as well, but perhaps ones wallet only requires a lesser number of confirmations..............?
As an experiment for you ...
Once you receive your payment try to spend it before there are 120 confirmations ...
The bitcoin protocol requires 120 confirmations in order to accept a transaction as valid, which comes from the fact that there should be 120 blocks based on this one (which includes the transaction) to accept it as valid and part of the longest chain.
Yes, there are 120 not 100 confirmations required, so in fact the pool pays your reward before it is truly accepted as valid and you can't spend the money you got for a much longer period