Some kid with no record gets thrown in a van by men with guns, and the full force of police psychological manipulation is brought to bear on them. They get told they're irrevocably destined for a lifetime of being brutally raped in the showers.
Is it any surprise that these young men with no experience of foul-play or maliciousness outside of the virtual world fold and turn informer with such regularity?
If I were an active blackhat, I wouldn't talk to anyone, ever. I wouldn't even invent a pseudonym, that's the first step to ending up on fox news.
EDIT: Eric Corley, publisher of 2600, thinks it's one in four: http://www.guardian.co.uk/technology/2011/jun/06/us-hackers-...