Well, the forum is set up to be user friendly, and settings on the servers cannot be changed as there are more than this forum on the servers. So, I'm getting a bit better at the battle. I have a few sites to try things out on before I do them here.
I do appreciate the server spam information and will run it by the head tech guys.
If you can't change settings at the server level or higher I fear you are fighting a losing battle. You need to try and control it above the application layer were vBulletin is, this means the server level. Have you tried mod_security? It's an Apache module that seeks out problematic behavior and ends it. If a rule is violated, then the user doesn't even get to vBulletin and resource usage is reduced (this includes your Admins )
@bkultra I think whats happening here needs somebody tcpdumping while such spam is posted, to find out what interface of the forum software is messed with.