Yes, 7-10 of them. And when you encounter them,just one multiboxer, say, on a battleground...you'd wish you never joined. Whole WoW xp is ruined. What's the point of playing the game? To explore what it has to offer, not exploit its mechanics for personal gains. It's really sad to see someone who is multiboxing. The person either can't do 1vs1 properly, lacks skill, and/or motivation to learn, or has some rage issues that are channeled via 5chars instantly bursting everyone around until all die. It's a masochistic pleasure. I apologize if i offended anyone who multiboxes with speculations regarding his probable or improbable mental issues or lack of skill.
It's just my theory and opinion on the matter.