Just because huge threads start slowing/crashing browsers and waste bandwidth.
Just FYI: One can directly get to the "last 50 posts" view of every thread by replacing the URL …/12345.html by …/12345+50.html.
That little trick has saved me a lot of bandwidth especially in the CYOA threads.
Is there a thread limit for boards? Because the /d/ catalog has lots of old threads that have been dead since the post cap was enforced.
No thread limit yet, though the server is about half full.