Just like it says on the tin, it can be a little frustrating when you see a preview on CBR and want to jump into a discussion on it but scroll down to find an accompanying thread has not been linked. Sometimes it's there and sometimes it's not. It doesn't seem to be dependent on the book or the timing, it just seems random and unpredictable. It could be we're missing something, but I know this is a little frustrating for some of us. Sure, we can create our own thread about any preview we want, however, that wouldn't have the benefit of the convenient traffic boost being directly linked to the preview would.
So, is there any way it can become standard for every preview? Is there any downside to this? If you're worried about forum clutter, maybe there could be a dedicated preview forum or something. But, honestly, I don't think clutter would be a problem on these boards; there are so many.... questionable .... topics that never die =)