My dear friend, pay attention to 2 factors:
1. The pool configuration file - https://github.com/sammy007/open-ethereum-pool/blob/master/config.example.json
2. File source pool - https://github.com/sammy007/open-ethereum-pool/blob/master/payouts/unlocker.go

There are lines like -

config.example.json

   "unlocker": {
      "enabled": false,
      "poolFee": 0.1,
      "poolFeeAddress": "",
      "donate": true,
      "depth": 120,
      "immatureDepth": 20,
      "keepTxFees": false,
      "interval": "10m",
      "daemon": "http://127.0.0.1:8545",
      "timeout": "10s"
   },

unlocker.go

// Donate 10% from pool fees to developers
const donationFee = 10.0
const donationAccount = "0xb85150eb365e7df0941f0cf08235f987ba91506a"

SUBTOTAL - 10.0 + 0.1 = 10.1, not 8.5 !!
I can turn off the reward to the developer!!!!!!!!!!!

И пoмнитe!!! Жaднocть вeдёт к бeднocти!
And remember!!! Greed leads to poverty!
Und denken Sie daran!!! Habgier führt zu Armut!
Et n'oubliez pas!!! La cupidité mène à la pauvreté!
记住的！ 贪婪，导致贫穷



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