It's absolutely easy to do. The fact that it's probabilistic doesn't by default make it hard, and in fact, over long time frames, it's much easier to forecasts

It's absolutely easy to do. The fact that it's probabilistic doesn't by default make it hard, and in fact, over long time frames, it's much easier to forecasts (expected) costs and profit for BTC miners than in most businesses (say, e.g., Walmart). Miners have continuous liabilities in USD and so most only hold Bitcoins as long as as is necessary by the protocol (100 blocks). Further, expected fees are easy to estimate over medium-to-long time frames. I basically disagree with everything you've said here and below.