We started off with CMS like that in our early days.
those sites are really designed for small groups. It may look high tech but they are all free and lack of plugins such as ban appeals, applications etc... Vbulletin is most advanced and secure CMS out there that you can pretty much do so much with (reason why it costs 300 $). All large communities usually go with Vbulletin or IPboards.
Also you would need to convert all user accounts, forums posts everything to a free content management system? Its like going from new technology to old technology. Not sure even if that is possible. If it is will take time and lots of money for someone to do this. And really we got some important posts here.
Sites are not necessary meant to be all for looks or appealing to everyone, but do its job. And I think we got both. As soulzz said we will upgrading to 4.1 but in my opinion anything but
VB is not worth it. And the reason we are upgrading is because lack of support for version 3.8 and more features available with the newer ones.
In any case, I appreciate the input Fuziion!