Heh, my first multiboxing encounter was a buddy of mine in SWG. One of his friends started loaning him an account, and then another. At the time, and for several years afterward, I thought man you're crazy but it was nice and convenient when we were out questing. Didn't really think much of it past that.

Never really saw one in WoW that I know of but if I'd seen them in a city I would have been like, 'oh cool that's just like my buddy', and if I'd seen them out in some remote area grinding through mobs I would've been 'farmer!', but I don't think I've ever reported anyone, what's the use?

My transition however has been completely organic, just progressed through a natural series of events.

Leveled a warlock to 60 and spent the next few months LFM. Said forget this I'ma play a priest or a warrior, people always want them in groups. But I'd tried warrior and no heals sucks... played priest but have to stop every mob or 2 to drink.... hrmm... I'll play them together (cause warrior was on wife's account anyhow)!

Got them to 60, then 70.... moved warlock to a new account so I could powerlevel with the priest (infinite mana anyone?). Then a buddy gave me his mage account... well hell, raiding sucks, let's go hardcore 5 boxing, lol.