LOL. I only met them on Thursday and they explained it to me. Should've listened but you know me and bonuses
Anyway, the impression they gave me was, you can take this once even if you have accounts at other CR casinos already, as long as it's not the one you are signing up for. Unfortunately the guys I met are on a plane on the way home to Oz right now but I'll drop 'em an email pointing to this thread for clarification.