In the land of Dorn, there is an entire industry involving the wholesale of magical items. This industry employs individuals experienced in the art of magecraft to enchant mundane items or weapons and give them magical properties, or to create magical items from the ground up (fire-swords, invisible cloaks, etc). The abilities of these items respond to mana, which manipulates the item's power. Mana is the life energy of a human being, which is present at birth and grows over a person's lifetime. An individual simply touches the object and forces their mana into it to activate it. These items respond to any kind of mana and is indiscriminate to a person's signature, which allows them to be resold and used by different individuals. However, The enchantments built into the object inevitably fade with time. The abilities of the item get weaker with repeated use and eventually loses its power. This allows for return business, as the user is forced to pay for new enchantments on the item.
There is a special service that this industry offers, in the form of luxury goods. These special items operate in the same way as regular commercial goods are, and are built with the same materials. However, they are specifically linked to a certain mana signature, and can only be activated by that signature. Linking a magical item's power to a specific mana signature prevents the enchantments from fading, allowing for infinite and repeated use, unlike the commercial items sold to the public. These brands are made for those who want exclusivity, such as a noble wants a magical item that can only be used by them, or a royal family wants an item that can be passed down to their future generations within their family line.
There is no planned obsolescence built into the magic items from the industry, as even they don't have the power to do that. This fading of power happens gradually with items built for use by anyone. The enchantments of luxury goods linked to a specific individual or family are permanent and last forever. How can this be the case?