Because they only let in trusted testers who will do the job, not leak information, and.. well.. do the job. This is mainly the same with Messenger plus! live and the WLM betas, only M$ always have idiots who leak the product and patchou has a much better understanding of the people who he chooses to become beta testers.
/ 
![[Image: dotlukas.gif]](http://bar.tweetbars.com/dotlukas.gif)
