That is not true, the increase for a level 20 to 21 mine upgrade is still 160 and it always has been.Another imbalance is the mine upgrades. Originally you got a 160 increase from level 20 to 21 and now it is a 600 increase meaning anyone who bought sketches at full price now has received 1/3 the value of someone who upgrades today, plus with the 30% discount on now for sketches that furthere reduces anyone who bought sketches prior to today to somewhere around a tenth of the value. Makes them look like complete idiots for buying in early.
So, not only are non - coiners getting shafted , those who invest a little also get shafted so Plarium is alienating even those who do buy. I would not buy again as this move shows they will make it meaningless anyway. Best just to play with no investment then to be made to look stupid by the company.