So have very nearly completed my T6 smelter I now have enough exp working with T6 resources to ask the question: Is there a point to have T6 or even T5 Essence (although it looks swwwweeeeeeeetttttt!!!) Stone and Gemworking chambers in my lair? To me it seems that the T4 versions of those shops will do everything that a dragon needs. Most the stuff I need to do can done in T2 shops with some heavy teched scales. So why don't I just put something else in my lair. Those T6 shops don't get me over the 3:1 line for stone, essence or gems (can get just over 1400 skill in each using a T6 shop which is ~70 points short ).
T6 Smelting is a different story. 3;2 : 1. (It can be done in a T5 shop)
T6 crystal shaping... not sure yet. Not at lvl 100 LS (6 lvls to go ) but will probably make a T6 version of it.
Am I missing something?