Not BB related but subject related.
I sold a domain for $12,500 to a 'solicitor on behalf of a client' in 2007. I had to sign a non-disclosure (which was quite rare back then) and various other agreements... it took over a month for the sale to complete. I remember it well, one of my first big sales, I was dancing around for weeks.
In 2008 they dropped the domain! I was like... WTF!!
Obviously it didn't match their needs anymore but... even today I'm lost for words. Yes, it has been re-registered by someone else (I did think about it but didn't have the bottle to do it :D).
Who knows what goes through these buyers heads. Same with the BB buyers that later drop their names too. More money than sense obviously!