[Opserty]

How do you know they are banned anyway? There isn't a way to differentiate between a legitimate guest and a banned user until they login in. You could just add them to the Banned IP list in the "vBulletin Options" of your AdminCP, if you are really concerned, whether this will affect the total I don't know.

Anyway why do you want to reduce the number of visitors? It would make more sense to leave it as it, I doubt many of your members will be that concerned that the number is 5 to high, let alone if they notice it or even read it!