Actually this post is kind of deceptive in a lot of ways. The artists, spell creators, etc... are not really involved in keeping the game running. They might be in the WoW division of Blizzard, but honestly they are probably sitting around working on the next expansion pack (like Cataclysm, or whatever comes next after that).
Right now what it takes to keep WoW running is admittedly a ton of computers, the number of which is directly proportional to the player base. Then you've probably got a skeleton crew of maitnence workers to keep that hardware running, and a few code monkeys who are the ones responsible for the actual patches if the "boys upstairs" decide to change something, the changes of course being patched into all of the systems rather than hand-written into each mirror or something.
In general they do not change the artwork or whatever.
Truthfully the only time this kind of a "staff" keeping the game running in any sense could be justified would is during the free expansions for holiday events and the like when they actually create content. An example would be the pilgrim's harvest thing (can't remember the exact name) that they recently added.
This is simply my opinion/observations.
As far as the Q&A team goes, generally speaking if they employ 200+ people who exist to give do nothing answers on forums and such, and then if ever pinned down to give a straight answer respond with such witty retorts when it doesn't happen like "we make games, not promises", that's their money to spend. Truthfully Blizzard's Q&A department seems like one of the most useless things I've ever seen to begin with, it's not like their whining means much to me. Heck, I'd love someone to pass me a check just to sit around and basically annoy fanboys.
Now granted, I'd imagine after these years 200+ people are running out of ways to basically respond to queries while saying nothing (we didn't hire presidential speech writers after all), but truthfully as a long time WoW player my general respect for the blizzard Q&A department is pretty much lacking. Sometimes I've even considered it akin to professionally trolling their own forums. One of the reasons I rarely bother to call the WoW forums anymore, if I have a serious quesiton the odds of getting a meaningful, and accurate answer, that isn't likely to change a few months down the road are minimal.
Now granted, a lot of this is on the company (Q&A giving the answers they are supposed to) but frankly I just can't see this as a strictly nessicary expense for what it does. Blizz's Q&A staff don't seem to result in any lesser degree of frustration than companies who don't even go through the pretensions.