I finally created two new channels: Members and Non-members, and added them to all my AdSense code. Will monitor and report back here, but those of you who run forum or membership-based sites, have you tried this before? My hypothesis is that members are more ad-blind... If the stats prove it, then removing ads for registered members would improve eCPM/possibly minimize smart pricing problems, no?
Any experience/comments/ideas about this would be appreciated.