ken_b - 3:00 am on May 8, 2010 (gmt 0)
The question for the publishers is are you seeing an increase in EPC to offset the drop in CPC?
Did you mean an increase in EPC to offset the drop in CTR?
If so, yes, more than enough.
But there is no way of knowing if the drop in CTR is at all related to Interest Based Ads, at least not that I know of.