It's especially this ship which should be unique, as there aren't any other ships that are hybrids (from a visual standpoint). If you spawn that multiple times, in an RP environment, it becomes extremely cheesy, and I can't think of the creator of that model to be okay with that. If I'd submit a unique model, I wouldn't want people to use it for their stuff. It's simply a no-go.
Best example is Ish'tar. It was unique, interesting. Now it's a boss NPC and pretty much every faction already knows about it and is not bothering investigating it anymore.