Instead of just throwing all amping sign to arena shop and keep the arena tickets at the same price, i think that when that is done, AiGrind should raise the cost of arena tickets a bit.To like 40 or 60 for a set (I haven't played the game for a while,so i dont remember how much a set of tickets cost.)
Pros of this:
AiGrind does not get bankrupt and warspear stays alive!(Yay!)
We dont win the battles all the time, so getting signs is a challenge.
We get 10-20 free arena tickets a day and when used properly,we could make some amp signs!
Free mcoins can still support our needs.
Playing more arena will make you more skilled.
Cons of this:
Still got to use mcoins a bit.(No shit)
Arena tickets cost more.
This is just my opinion