There was also a similar deletion a week or so ago in which is lost my 700 reply thread.
I have PM'ed grue multiple times asking for clarification without any response whatsoever, it seems he just randomly comes and deletes a bunch of thread from the first few pages.
There are still plenty of such threads left, so he must just be doing a quick once over.

Also, any account seller that says the accounts are not cracked is lying.
I noticed he took down quite a few legit threads as well (selling VBA verified paypal accs, not hacked) and alike.

Oh well, It was a good run, BTCtalk seemed to be a good marketplace with minimal mod interaction and loose rules but no more :/