Maybe I just read it wrong. While they probably don't need help, I'm sure it's appreciated. Vbulletin seems like the easiest thing too if they are having trouble making their own, you just buy it, but I'm not sure how they'd go about putting it here.
Dont be so cheap, please spend the few dollars on a decent forum software and be done with it -.-
I don't think it has to do with money at all, more of will it work on the site. I don't know much about programming so I can't go further into it.
Cormyn (a former administrator/employee for AG) mentions here several times that the person who wrote the forum software didn't make it efficient (they no longer works for AG either) and that vbulletin wasn't compatible, but things could've changed since then. It's been two years since those posts.
I did read that thread and it seems that armorgames is using some other type of database instead of MySQL Database, on which vbulletin depends so it seems it realy isn't a valid choice. too bad... Oh and another missing thing - smilies...