Mining got screwed up by some bug, and lots of fields just sort of became unbalanced... so what you see right now is not going to last long. I wouldn't even say it was a beta, it was more like a very early alpha version of the mining mod. Bugs galore.
Hell, it was even said that it was a complete test. Multiple times in fact... So what you should expect is a complete overhaul in due time. Instead of whining about profits being moved about however, what I would suggest is that you are glad that you have an option now not to mindlessly tradegrind like before, but now have the option to mine as well.
