Hm... here are my ideas...
Basically Items would be classified as things that there are multiple of, and they can be anything from ingredients to items that can heal, whatever. Basically giving your character temporary abilities that they don't have. I think people would be able to create their own, they just would have to contact me about it - y'know, before creating an item that can kill instantly or bring back the dead.
Artifacts would be classified as things that there are only one of, and they would only be created by an admin, and, naturally, would be unique in their power. maybe there's a writing competition for these? Idk.
There's advantages and disadvantages for this. On the advantages side, it would help people get engaged and keep people interested, but it would shake up the playing field, and people wouldn't be as equal. I don't know. I'm also adverse to chipping away at the freedom I promised people...