The following is an excerpt from a recent interview with Tom Chilton (co-lead designer) and J. Allen Brack (producer) of Blizzard. Check out the whole interview here: http://www.eurogamer.net/article.php?article_id=221566
"Eurogamer: The new recruit-a-friend initiative has some pretty amazing incentives for fast levelling, both for new players and veterans. Isn't it just a multi-boxer's delight, and ripe for exploits?

Tom Chilton: [Laughs] Well, we actually are perfectly content to endorse multi-boxing to some reasonable degree. If a person wants to go out and buy a second account and power-level themselves, we're okay with that.

J. Allen Brack: Also, part of the point of the system was to get everyone to the point where they could actually take advantage of Wrath of the Lich King. We want to make sure that when the expansion comes out, new players can roll a Death Knight and be ready to go."