Well, I've seen some professional books from the outside... and they are HUGE... so I certainly don't expect that type of volume to go in a PB, that would be overwhelming. I'm looking more for variety and uniqueness, not necessarily volume.
Quality not quantity is the motto here
I just felt that the NG playbooks were really all the same for the most part. I understand that there were differences between them, but in the end the impression I got was that there wasn't enough difference between them to really intrigue me.