Aw, this would have been such a great idea. But yeah, I can see how people can just replicate guilds (or a person can create the same guild elsewhere even if they were part of the actual guide before... and can use that as an excuse). Not many guilds out there would spend the money to make their own website =/. It's just different from WoW. If there are actually websites made and lots of members to support it... perhaps it's possible.
I think it's too hard to confirm if the person is actually the guild leader if there's no actual website. Words can be easily twisted. Despite how this is a good idea, I guess it can't go through... There's not a lot of solutions to this issue. Furthermore, there are lots of guilds out there as well, so what can be chosen to be on the list? It would just seemed biased if certain ones are chosen... unless there's a determined number (50 people have to be in the guild at least, etc).