Extremely basic plugin I just threw together as a test. Doesn't allow hopper crafting. Decided to upload it to spigot in case any server owners were in need of something like this.
- Tested Minecraft Versions:
If you can't understand why this would ever be useful to a server, I'll enlighten you. Many faction servers disable the crafting of hoppers and make them expensive in shop.
No commands, no permissions, no config. Just put it in the /plugins directory and start your server.