He is a wise man who does not accept the risks involved with posting on the Bitcointalk.org forums based on security and other reasons too long to list here, it goes into the owners and runners of Bitcointalk among other things.  I'll always love this place, but there is definitely aspects that people should keep themselves aware about as far as monopolies in the communities go.  Not to answer for the guy, but I remember it definitely was a big motivation to make better forums and more Bitcoin communities, Vlad is the man.

I highly recommend everyone get an account there to have the ability to communicate with more than just the people on these forums.

http://bitcoin.org.uk

And for no reason, everyone should always check /r/Bitcoin http://reddit.com/r/Bitcoin/ (modded by Theymos)