"Why multibox?" -- that's the question I keep getting. Let me tell you why. In my case it's 8 characters at the same time. 8 characters have more DPS than one -- no, really! Also, being able to solo raids, instances, heroics etc isn't all that bad. Or for pvp, 8 Warlocks means 48 dots on one target at the same time as having 14 pets, 8x wild imps swarm at the same time as chain-fear. Or how about playing Death Knights on the Broken Shore, with all the rares, Sentinax- and Unstable Portals.

Having 8 characters also means 8x chance of pets and mounts to drop on EVERY SINGLE KILL, on mobs/bosses/rares that has something in their loot table.

In Legion, I made millions of gold a day if I farmed properly. This is 2 hours of farming:

.. So why multibox? Because I can! ;D