We don't pay for air to breathe ( normally). We don't pay for sunshine, rain, or dust. English, with Latin and Greek, has a name for everything that exists and many "things" that don't have a physical existence: ideas and emotions, even the so-called "supernatural". Nothing exists outside nature. Everything must comply with the laws of nature: if something seems "beyond" nature then we simply don't have knowledge of its nature.

you just use the stored energy in the magnet. the magnet will lose it's energy and it will stop

how many volts does it produce