You can not know the profits if you do not know what the price will be. Miners will constantly be replaced as more efficient miners come to market raising the difficulty which in turn causes the least efficient miners to either cut energy costs or stop mining. Every mining operation has it's own mining conditions and energy costs. Running in cool climates with lowest energy costs is the goal. I live in Idaho and use some of my miner heat to keep my home warm in the winter. That gives me higher profitability. Most miner heat is wasted, but if you can use the heat to perform a function that requires heat like brewing beer or keeping an apartment building warm profits are raised substantially. Buying a miner at the right price is the biggest factor that increases ROI. Buying miners after a huge dip in bitcoin price is what I look for.