If non-Supporters have to spend cash to do something, there absolutely cannot be a way for Supporters to do the same thing without spending cash since, as far as I am concerned, that constitutes an in-game advantage.
I fully agree with this.
But you may not have understood my point: I want team/arena name change to be ONLY for supporter. So it cannot give an in-game advantage since nobody, supporter or non-supporter, would pay.