@Justin Matmor: A name listed on BB yesterday is gone today. Why?
1. It was sold.
2. It was "removed" (a listing status that can be seen on your BB profile.) BB has a problem with the name; usually the name does not resolve to BB, typically the NS are not properly set or the name is listed somewhere else.
3. The name was delisted (requested to be removed from BB) by the owner.
4. The name was detected by BB as expired.
5. There was a UDRP or other ownership issue, or a trademark issue, or similar; BB was directed (or elected) to remove it.
6. The name was sold by the owner in violation of the BB TOS and so of course BB delists it when they detect this.
In order for the integrity of the BB listings to be maintained, it is evident that they must periodically check each name on a relatively frequent basis to ensure that #4 or #6 above has not occurred. Generally simply by checking the resolution of the removed name and/or the whois, it is easy to detect when a name has been removed for reasons other than having been sold.