A few threads on another couple forums I frequent that also run off of V-Bulletin and after about 20,000 posts they start a "part 2" or "V2".

The mods all say something about threads not loading after that number according to V-Bulletin.

I have no idea if that is true at all or not but I can see a thread just maxing out.

Seems this one was only like 13,000 posts????