The Black Coupon says it restores a failed enchantment of a weapon. Since I received 3 of them, I wanted to use them up.
I enchanted an A Grade Weapon in a very relaxed manner, because I would be able to restore the item without problem. The item failed and I could not restore it.
Later, of course there is something in the forums how the duration for restoration of items is for the time in the past year. Wow, that makes no sense and I did not suspect this.
All the time, energy and money I spent into this game is wasted on one exploit.
Whatever you want to call it, you did a bad job and it cost you a player and your reputation. On top of that you ruined my day.