I take 20% off all blocks that you are mining and dump that on the market.
You get 10 maybe 20 % more hash And you pay more electricity costs.
Thank you for making me rich.
Something like that.
Fair and to the point.
For some miners this is bad and I recommend them to move on.
For some miners it is ok and they stay on the pool.
And BTW, there are wattage measurements somewhere in grs-sgminer forum, so that is not hidden.