The only way I could see this happening is if it was to replace a high level sword, such as the currently broke lvl 35 sword. However, because of this not a lot of people playing on the server will be able to use these items. Making each knife cost a different amount would be cool too but I don't know if that would be possible to have a level requirement for things that cost points. That being said there are a lot of knives to choose from, and it would give a great boost to the customisation available to the server.