Both pools you mentioned have fairly safe variance of coins whereas zergpool mines coins that are still mostly new or not available on other autoexchange pools. or plainly unstable in terms of price, which is why estimates are... estimates.
People just have to learn how things work.
And atm we need zergpool to work, had to move all my miners after a hundred retries...


When your balance actually DROPS after it's confirmed, that's the pool taking money out of your pockets.