Nope still don't know why you'd want to lock old threads, just because some Nutter is going round posting.
If people really don't have the wherewithal to look at the OP date that's their lookout.
Same as the posters who post on a 600 comments, read the OP then reply. It doesn't take a genius to work out that if a post has loads of comments the OP will have posted more info.
I'm sure most posters don't know how to just see the OP posts.
Anyway on another note, what does the Nutter post? By the time I open up they've been deleted!