The stats are correct but the return is almost always lower on zpool than on the other pools that doesn't autoexchange.
ex:
skein
zpool.ca 24hour payout per ghash: 0.00449BTC
yiimp.ccminer.org payout per ghash: 0.0062BTC
+38% if you mine on yiimp and exchange your coins yourself.
But zpool is more profitable than the nicehashminer..
Fact i actually test (not speculate)i've test with multiple rigs had 1070x4 on nicehashminer / another 1070x4 and zpool nemosmier /and another 4x1070 on nemosminer Mining Pool Hub
the zpool version is making more every week so i don't believe there is any theft going on my payouts seem to always be correct..
ex:
blake2s
zpool.ca 24hour payout per ghash: 1.17497BTC
yiimp.ccminer.org payout per ghash: 0.41053BTC
+186.2 if you mine on zpool
zpool blake2s and lyra2v2 are 2x the profitability compared to yiimp.ccminer.org....