That is your answer .... some pools have 0 extra reward for finding a block .... I mine with luckpool, which DOES have a 1,000BTCz reward for finding a block, which I do every 3 or so days .... but check the faq of whichever pool you are mining with - that will tell you. Obviously if you were rewarded 12,500BTCz for finding a block, then there would be no BTCz to split between all the other miners, so that is a totally unrealistic expectation. Similarly you would have earnt 0BTCz until you found a block, which I am sure would not be ok with you.

The only way to get the full 12,500BTCz is to mine solo, but if you are a low hash miner, you may NEVER find a block, and subsequently may NEVER earn a single BTCz ..... hence the beauty of pools.