Ok so first let me preface what I'm about to say with this:
I am not talking about the psychological motivations.  We could debate that until blue in the face- though I'm willing to bet the simplest answer (they're not that bright) is the easiest answer.
 
I'm asking of the people who post threads that get locked (excepting delete/combine requests- that makes sense), what are the user statistics?  What's the average user post count before a locked thread?  What's the average user subscription age (I mean how long have they been a user) at time of first locked thread?  Of users who get threads locked, what's the average locked thread count for that user (for users with multiple locks counting them as one user with x amount of locks)?
 
There's are psuedo-serious questions.  I'm posting this as a blog because this is what goes through my mind.  I still like to go through and read locked threads.  And while I would expect half of them to be "hi I'm new," way more are you tube spam or other buffoonery.  So today reading them all I began to wonder the statistical picture of the "future locked thread poster", and how they fit with my mental preconception.  Anyways- just some interesting food for thought.
 
On another topic- on Delete/Combine requests- I'm fairly impressed people notice the things they do, but I do wonder what the mental makeup of a wiki-er is?  I like the design and function of wiki's, but for me the editing isn't my bag (tbh I tend to fall to sandbox issues, being able to edit a wiki means I'll eventually commit vandalism) so I stay away from that, but reading through the stuff that's out there is cool and incredibly valuable (for me at least).
 
Ok so weird off-topic thought bubbling done for the day.

I think that the results would be skewed.  One thing I often wonder is that of the threads that get locked immediately, where the poster is "new" to the site, how many of those are alter egos of someone who already posts here regularly but is trying to be anonymous?