Quite a compelling argument you have there. I said that the unit's cost is the balance, not the unlocked/locked status. You have no counter other than to suggest I am either blind, ignorant, or just plain stupid.

Why does a T80 cost more - do you mean in stars to unlock or force points during a game?

They cost more force points because they are a more powerful unit.. well I already explained that in my previous post where I said it's a very simply case of balancing risk vs reward. They can be more effective on a unit per unit basis but also yields more victory points to the enemy on a unit per unit basis.