camper - 12:42 am on Jan 11, 2006 (gmt 0)

My experience has been pretty much the opposite. Higher traffic days have slightly better EPC. And on the few times when I have had very steep traffic spikes, EPC goes way up because the site gets populated with better, more interesting ads by national advertisers (for me it's been image ads and flash ads, one for a new hybrid SUV and one with a cute animated reptile), and both CTR and EPC go through the roof on those days.