[Plumper]

My point exactly. They were built so the keels could fall off. What is to say that the rest of the Bavaria fleet doesn't have similar problems but, because they aren't being raced aggressively, one hasn't fallen off yet. Keel issues are even present on older boats, think of the C&C smile, the crack they always have where the keel joins the stub.
http://www.cncphotoalbum.com/doityou...mile/index.htm
Bolted on keels have and will continue to fall off on occasion. Age and dissimilar metals will just exacerbate the problem. That is why surveyors check keel bolts.
I'll stick with the idea that I would not choose the boat based on how the keel was attached. I would look at the rest of the boat and the history of that kind of boat first.