Take leather shoes, for example! They generally fell into four categories: full-grain leather, split leather, bonded leather, and artificial leather. Of those four, only shoes made from full-grain leather counted as genuine leather in the true sense. Split leather had a plastic coating applied to its surface to make it look more attractive.
As for bonded leather... it was made by processing, gluing, and pressing together scraps left over from cutting leather, much like boards pressed from sawdust. Most of the time, its quality was not even as good as artificial leather.
Yet even with bonded leather, those merchants dared to thump their chests and assure you that their shoes were absolutely genuine leather. Even if only one percent of a pair consisted of bonded leather and the other ninety-nine percent was artificial leather, they still dared to label and price it as genuine leather footwear.
Look at how the goblin merchants of Azeroth did business. Even for things like bombs and land mines, their instruction manuals warned that the products sometimes failed to explode.
In short, the honesty of Azeroth's goblin merchants sometimes made people feel that they were far too honest. Their honesty left customers at a complete loss.
That was because these fellows always offered some thoroughly discouraging warning that ran directly counter to what you wanted from their products.
If you wanted land mines and bombs that would explode and kill people, they told you that they might not explode or kill the enemy. If you wanted a gun that hurt others without hurting you, they told you that it might fail to hurt anyone else, and its barrel might burst and injure you instead. If you wanted a parachute that would hurt no one and simply save your own life, they still told you that