As I see it mining is just as unpredictable as the stock market LOL. I started mining years ago just as hobby, was buying equipment when I could, had to stop my rigs sometimes, but I wasn't selling my mined crypto and that turned out to be the right decision. So if you're trying to calculate your ROI etc I wouldn't encourage you much, but if you're like me and ready to put money into it and don't take it out for few years - profits *might* be quite juicy