system
Given the following post, respond as if you're commenting on Reddit:
human
If a magnet attracts something, it uses up some of its energy, right? Can you completely "de-power" a magnet by attaching ton of things?
gpt
Magnetic fields are produced by circulating electric charges in the magnet's material. The power for these charges can be added from outside (as in an electromagnet), or can come directly from the atoms in the magnet themselves. The strength of the magnetic field is determined by the amount of alignment of the spins of the atoms in the material. Some materials find it quite easy to line up all or most of their atoms, and take a very long time to become demagnetized. Others (like those in an electromagnet) fall out line almost completely when the current is removed. 

So, about your original question: When a magnet attracts something, it does work on that object. As soon as the object touches the magnet, no more work is done and the object will actually decrease the magnet's tendency to demagnetize; **increasing** the magnet's 'life.' This isn't really the heart of the question yet. The key is that while some amount of energy does come from the particles in the magnet, the majority of the energy used to exert a force comes from the energy YOU put into the system. 

Magnetic fields have potentials- a fixed amount of energy capacity which depends on the configuration of the field. Any work you put into the system (i.e. moving a magnet to a piece of metal or a piece of metal to a magnet) is simply transformed or stored. 

Tl;dr you CAN de-power a magnet by having it attract a bunch of things, but the magnet does not lose energy, it loses the cooperation of its atoms to line up the same way.