I finally found the time today to try out my copy of BT4 Beta. :] So far looks good, however I downloaded my copy more than a month ago, so I don't really know if it's up to date. I'm downloading the VM version right now.
As for you point about motives for cracking WIFI, I think your absolutely right. Most people are either board, want to steal information, or just want free internet. And your also right, Most people planning to abuse the victim's connection, they probably would go for an easy kill... or as you said, an already dead connection.
And, if your government's after you, then you may as well count yourself caught...
WPA is about the most secure the average computer user needs to be.