I'm currently leveling my own guild, soon to be 8. We're doing 1-2 levels per day and I got 60 members, allthough not everyone is active and online.
I started it 20/10-2012
I'm botting questing on a battlechest (only 5 euro on blizzstore until tomorrow) and questing on my own at my mainacc at the same time.
At the sametime I'm running guildinvite addon + plugin and writing in generall in low lvl zones sometimes, offering gold for those who reach X ammount of guildactivity etc.
It's going faster than I expected and after you reach 4+ people will be more positive to joining, hope this helped someone.
Btw: Kick's leveling profiles (or the botclient) might be abit buggy by questing but I have no problem leveling 1-20, 100% AFK.
The only problem that I got is getting DC'd randomly but i've been doing 1-10 now without any DC at all.
Did 1-20 at the other account while sleeping like.. 6 hours? It gave me 6 million guildxp, and that was just on one account.