From what I can tell from a little reverse engineering, the ban system does not have any hierarchy system in place, and anybody who has ban rights can ban, and anybody who has unban rights can unban. There are no privilege levels that dictate who is able to ban certain players, and who is able to reverse bans of other players. On top of this, even if such a system were in place, it would be very easy for any scripter to override.

They're not going to tell you the truth, anyway. And an IAP cracker wouldn't even work on an MMO because the server is the one who decides if you've purchased anything or not, the client has no authority in this matter and if it did, it would be 100% accurately, automated detectable. They shouldn't ban for it if it's literally impossible to use.