I myself own a clan (a.k.a. guild) on RuneScape. It's a small one, and we don'y do events much, but yeah, it's more of a group of friends thing. I have my friends, my friend's friends, my friend's friend's friends, and so on. If you play RS, PM me
It's more of a secret clan than anything. If a clan wants to fight, we will, but they'll have to know about us, first.
So, having 2 guilds is out of the question.