Current mining unit system has many flaws. Calibrating mining units is boring as hell. High tier ore tiles are stacked together making them easy to find, so most tiles are claimed by now. Having people keep the tiles claimed and having passive income forever is unfair to any starters. Taxes pose a problem if ore prices dip too low.
Instead of placing bot orders in the market to help people sell their ore and pay tile taxes, money print quanta and create a new inflation problem trying to solve current problem, I suggest going a completely different route.
Make mining units placeable on dynamic cores. Make tiles have a finite amount of ore and have them reset and be randomized again every second asteroid reset or so. Have people mine and deplete the tile using their mining ships (ships with mining units and scanners). It would be simpler, more fun, engaging and fair to starters. No tile claim hoarding no taxes no problems.