but using nicehash to point miners compared to zpool is a whole different animal.  different payout/share scheme, different rates, etc... its all different.  People can pay insane amounts for hashrates sometimes;  and theres never a way to predict an increase, you can only see it and swap methods if that's the case.

The reason why NH is advertised is because people like to rent NH and point at a pool;  thus zpool is one of the choices for people doing rental tests or people whom down own miners.... that should be more than obvious.