Someone who may or may not know what they are talking about. How much do you think it's worth? (No need to explain why, just tell me how much.)
Keep in mind that fire aspect adds tons to the amount, whereas knockback doesn't really effect it. (Probably not 75k's worth, but it's at least reasonable) Oh, and I don't believe you are as active as you used to be, are you? Even since 1.3, it's price has skyrocketed if you weren't aware. The price goes up every day.
