Any grower in his right mind wouldn't offer bud for sale online to a stranger.

PM's are useful for people who want to continue a discussion with someone and not have a lot of BS replies. Or asking for a more detailed information, lots of reasons.

Ultimately i know this wont go anywhere as its a "preventative" measure, but i'd like to point out that a pm system works fine elsewhere.

Also, as to owners being held responsible for whats on their forums, Then you should probably delete every gallery and grow log. Because last time i checked, growing pot was illegal in most states.