King Thranduil: Make him cost more than 3000 so I won't see this filthy and uncouth dwarf again!
OK, I will never ever try to be humorous again, since on second thought even I cann't stand the terrible sense of "humor" myself.
For Erebor, I could understand why Throin III is more expensive since clearly they want to make him the core hero of late game, as in the book he is the first Dwarven King of fourth age, although I am not so sure how to appreciate his power.
For Iron Hill, it is clear Dain Ironfoot is the most important hero and Throin III is still very young, problem is should we further strengthen Dain so he could be worth more than 2500?