Howdy,
I'm afraid I don't know any of the other statistics related to the beta, but I think overall that a lot of people were in difficult situations and didn't have a chance to prepare as well as they wanted to, especially those trying to take it in the beginning, but also people later in the month.
With such a short period of time in which to schedule the exam, everyone just had to take it when they could. I'm not sure waiting a week or two later would have helped *everybody*, because some folks simply were not able to take that time to study, because of work deadlines or other situations.
On the beta, you just have to go for it, regardless of your circumstances.
But for the *real* exam, you can take your time and schedule it when YOU want to take it, as opposed to during that short time when the beta is offered.
So the best I can say is that taking the beta is a way to get a feel for what the real exam is like -- except that the real exam is easier! (because it's so much shorter than the beta

)
Even if you don't run out of time on the beta, there are *very* few people who can keep focused for such a long stretch of questions (and time). I know my brain shuts down after the first 70 questions (which is, thankfully, the exact number of questions on the *real* exam

)
So, even without the scheduling issues most people had with the exam, the beta is NEVER an ideal way to really get certified. But it is an opportunity, and I believe the people who just happened to already be pretty well prepared, and had the time to study for the beta, were in good shape to be able to take advantage of that chance to get a real certification. But for many MANY people, it simply came up too quickly to be adequately prepared, and so you have to consider it as an opportunity to get a free 'practice' run at the exam... and we DO have evidence that people who take any of the exams a second time will ALWAYS do better than they did the first time.
cheers,
stick with us and you WILL pass this thing (and it will feel so much easier than the beta

)
Kathy