Good question.
You see, people who hire for large corporations look into several things or hobbies that could make a potential person inefficient or hard to work with. One of those factors being Online Gaming (You can thank Faux news and CNN for that).
Companies that do this are many and vastly varied; but include warehouse facilities, Escrow companies, marketing corporations, digital trade, anything to do with Stock...Pretty much any company that has a paper-pusher position have listed Online Games; particularly popular ones like WoW; as a big 'ol red STOP sign.
Is it fair? Hell no; but that's the job market we're in - and the fact that you're not in it now doesen't mean that years down the line, your post won't be there to dig up from the Battle.net forums; even if it's been years.