As we already talked about in the mumble, it would be nice to have such pitch. This thread is mostly for collecting ideas.
From my perspective as a developer, these are the important characteristics.
* Open source.
* C++
* Lua plugins are much easier than java.
From a user's perspective?
* Lua plugins are easy to write - guides etc.
* Faster than vanilla.
Cuberite: Minecraft done right.
Cuberite: Performant Minecraft server
Cuberite: Minecraft but without those performance issues
Sales talk:
Tired of struggling with those slow Minecraft servers? Then now for only € 0,00 we preset Cuberite. This beast will allow you to run a Minecraft server on even the slowest of devices. Even a Rasberri Pi 1B works fine.
Cuberite: Easy and efficient Minecraft multiplayer
Cuberite: Only 1 segfault a day

A segfault a day keeps the ram usage away
Please and , this post should only contain serious attempts of creating an 'elevator pitch'
You're lucky this elevator doesn't run Cuberite because we're unbelievably screwed if it does.