Just checked (Nov. 25th, 2022 noon CST) the ore markets.  Average High sell price is now:   Bauxite - 3.38 Hematite - 4.25 Quartz - 2.04 Coal - 7.15   Somewhere around 7 is a line whereby a tile won't pay for itself without including calibration bonus ore, talents, and/or adjacency bonuses.   (Math:  400l/hr * 24 * 7 = 67,200l/week.  500,000/67,200 = 7.4)   Yeah, I know that calibration bonuses, talents, and adjacency bonuses all count, but