I honestly love these things as a possible alternative to printers, especially with their "High Risk, High Reward" aspect. However because of the difficulty of extracting bitcoins out of the bitminers with the little minigame, I dont think the current output is suitable for possibly competing with printers. I think this because I spent 60k on the highest end bitminer possible, and it takes about 5 minutes to aquire ~400 bitcoins. Each bitcoin is ~65 dollars each which is 26,000 dollars per 5 minutes. This sounds great, at first but look at the downsides. They are incredibly loud, and silence bombs are too expensive and hard to get. They also have no upgrades, and produce the same the entire time while printers constantly get better. The minigame also makes it impossible to quickly grab some cash and prepare if a raid is occouring, where as printers you can grab and go.
Due to their difficulty in extracting money, loud, constant relatively low rate, and price point I beleive that their output should be buffed from ~400 bitcoins per 5 min to ~450 bitcoins per 5 min on the highest tier bitminer., or to silence them better. I like the minigame and do not wish for it to be removed as it adds a new aspect to the game with the inability to grab a large chuck of money and destroy it before raiders get inside.