My subjective impression from our single session of Nobilis (next one this Wednesday) is that involved anchors equal player activity. One thing to keep in mind is that since players in this campaign are meant to have a considerable amount of author power (to get all theoretical for a moment), you have considerable leeway to involve your own anchor(s) in events, which means you have considerable ability to set your own activity level. IIRC, the only anchor I threw into the adventure was New Dave's Valerie, whom he created for Tony. Greg and Bill added their characters' anchors into the mix themselves - I had completely forgotten that Greg's Annaliese Grebko was a world-class skier, for instance.