The fact that at least 6 of them are laptops mitigates the need for huge power surges a bit as long as he limits his ganking raids to the battery life of the laptop and charge them in sequence later. Also, since this is his 'ganking raid' setup I highly doubt he runs all of them at once. Maybe at most 2 computers for a group of 5 to power level (if he made each account through a recruit a friend then thats x3 xp for each character) to reach his target.

Seriously though I want to know what this guy (and I'm assuming this is a guy or the emphasis would be more on a girl gamer than on the set up itself) does for a living to be able to throw down almost 6k in subscription costs alone as well as $1560 on WotLK copies. Those also have to be pretty beefy laptops to run 3 instances of WoW at the same time.