OK, I was getting about 800 uniques to one of my affiliate sites from Yahoo this generated plenty clicks (about 70 or so) which I was quite happy with. Now what I think is odd. I was averaging $0.25 cpc across all my sites. Yahoo have completely de-indexed the affiliate site - ho hum. And cpc average for the remaining sites went through the root the next day to an average of $0.70 and it's remained at around that level. The affiliate site was around the same average as the rest of the sites (0.25). If this is smart pricing in action then I for one ain't going to complain - smart priced down to 0.25 ? seems a bit high to me. But it seems very odd (coincidence) that straight after that site stops getting traffic, cpc jumps considerably.