Why don’t you make your miner fee based unless it’s on your pool? 2.5% dev fee anywhere other then Nicehash? You still get paid either way and it adds incentive to use it on your pool.
From my perspective, as a miner, I can use it, but the speed increase isn’t worth it compared to using a normal miner due to the low payments on Nicehash that are largely controlled by bots. More people would be inclined to use your service (miners and hash buyers) if it wasn’t a automated bidwar between bots that always tries to keep the price as low as possible. That’s why so many people use other pools and I’m sure you guys also see that’s happening.