It's really dumb to make so much times mines, so why don't you make more big capacity of them?
In version 5 still people buy diamonds and it's not comfortable to increase, increase and again increase capacity 30 times for exaple for 25 000 population in wood mine , when you can do that with 1 level of mine wood/iron/stone as v6.
Dear admins, please do something for users who maked your game so high
OK, you have work on version 6... no problem... but v5 is alive and you dont make new changes 1 year...
How can one user be glad to play your game when you do not make simple changes to make his developing more easy...