Plus there is usually a cost to making a new forum, who is going to want to pay that?
Actually Chris, many websites do it for free and with a lot more variety, easier and better formatting than WarLight's. Invision and PhPBoards for example. Never tried PhpB myself, but invision is super intuitive for forumers, and very easy to manage as an admin. Also has a lot of options such as name check so people can only register using a WarLight name.
And the costs are also generally extremely low, too, so if for whatever reason extra autonomy or an easier domain is needed, it is rather cheap.
In general, I very much enjoy the idea, as Fizzer's moderation is generally not too effective, and the forums are super restricted. The formatting is actually glitchy and doesn't have some other common options (like quote inside a quote, or name of the person quoted, or strikethroughs, etc), does not add Signatures/Emoticons and is just full of badly placed ads (I mean, even as a member, the forums per se occupy only 55% of my screen. The other 45% is a huge black blank space where ads would be; could've been better used).
I'd totally give a plus, and more than willing to help build up the forum's mechanisms. I've tried making quite a few on Invision so I know some basics.