I saw a few forums, they are very old, has a large no. of posts and are like an authority in their niche. But I was amazed to see that they are running vBulletin 3. I have nothing against vB3, but it was like from 2008. There are many options for them to switch. vBulletin has had at least 2 major versions ever since.
What is the secret behind staying with vBulletin 3 ?