I think primeGPU made a wrong business decision to offer this miner in exchange for XPM when it came out. He had the fastest miner in the beginning, it made sense to solo mine at the time. But a lot of people who had the right hardware, didn't have 65 or 35 XPM, so they used Claymore's miner instead. Then Claymore's miner became better, difficulty became greater, giving everybody little reason to switch and go solo. There should have been a 10% dev fee from the start, instead of 65-35-25XPM per license. PrimeGPU would have way more XPM now and so would the users of his miner.