DP has its regular visitors it doesnt need to go for more SEO. Dude its really very Huge Forum. I would like to stick with it
Just wait for vbulletin 4 - its supposed to have built in Search Engine Friendly URLs and built in sitemap generator. After VB 4 comes out, weigh your options and decide what you really need.
If you decide to rely on vbulletin 4 for SEO purposes alone, read this: http://www.vbseo.com/en/feature-matrix/ I honestly believe it works great as I am top on google for what I want to be.
Having SEF URI's won't do much -- you to take care of duplicate content, descriptions, keywords e.t.c. IMO vBSEO is worth the price and certainly does give your board that extra edge.
I believe DigitalPoint has been around for so long, that they chose to hand code things on their own and at this point , like most of you stated, They dont need to change and everything is going great. Thanks to all the written opinions! Based on all my feedback and my own research , im leaning more and more toward getting VBSEO. Like Shawn said, VBSEO would be worth it just for the Duplicate content. Im very much so considering VBSEO soon after i purchase VBulletin 4.0 forum. Thank you all. -C