Because 80% of the people there aren't actually testing anything, they're just there for free epic gear. The majority of them think they get to keep the stuff they get as well. It's obvious, just watch trade. http://bit.ly/h56EfA

Also, Nalorakk was always easy, just sayin.
http://bit.ly/dMfKZS

So, in other words, if you want to actually wipe them out, no better time has ever existed to do so. Wait until they rebuild and regain their strength, and it may become an impossible task, and one you'll live to regret not accomplishing back when it would have been easier.
http://bit.ly/extNQQ