wp should point to nicehash if their profit is higher.
why not
Because of many reasons.
1) If we point at nicehash, and someone rents from nicehash and points to us, what happens?
2) I'll get nonstop complaints that the reject rate went from a few percent to 10+%.
3) We would have to enforce using a specific miner (sgminer I think) because nicehash relies on extranonce extensions that we don't normally use
4) No one is really buying X13 hashrate on nicehash anymore, since there really isn't anything to mine...