BCH is also an interesting case because of the covert exploitation of asicboost, which was addressed by segwit in BTC. that amounts to a 30% cost advantage over other miners, discouraging decentralized mining. this is why the vast majority of BCH hash power comes from unidentified miners. it's presumed to be mostly bitmain's hash power. if you're mining BCH and you're not bitmain's patsy, then the only other explanation is that you are extremely bullish on BCH vs. BTC.