Heroes 6 - Discussion

Why is it bad? We need to fight against the abundance of cheap, high-level heroes in Might & Magic.
I've made some adjustments:
Hero cost = 1000 + (1000 + 250 x D) x L, where
L is the level of the hero being purchased,
D = 0 if the difficulty is Very Easy
D = 1 if the difficulty is Easy
D = 2 if the difficulty is Normal
D = 3 if the difficulty is Hard
D = 4 if the difficulty is Very Hard
D = 5 if the difficulty is Heroic

Is this better?

A level 1 hero will cost between 2000 and 3250, and a level 20 hero will cost between 21000 and 45000, depending on the difficulty level.