Yeah, once discovered, and on a PvP server, one person owning horde & alliance toons shouldn't be allowed.

For example, there's a raging douchebag on Laughing Skull named Pandemoniumx. Visit the realm forums and you'll see him. He's got a lvl 70 Hode warlock named Pandamoniumx, and a lvl 70 Alliance paladin named Pandemoniumx. On his paladin, he created a guild called Disciples of Pandemonium. On his warlock, he sits in the lowbie areas (usually Redridge & Duskwood) constantly griefing players, then logs on his paladin and whispers them to join his guild - if they don't, the warlock will continue to corpse camp them. Therefore, he's got well over 300 members in his "guild" who just wanted to avoid being corpse camped.

That activity seems to be strictly breaking the reason for not allowing one account to have both horde & alliance characters on the same PvP server.. and I'm stunned Bliz hasn't done anything about it. I do all I can to encourage the Discples guild members to ditch that faux guild for one that actually means something..