I've read repeatedly that removing the adwords code from lower-performing pages results in better earnings. I even understand some of the reasoning behind it, although IU have to think it through again every time I come to it. :)

However, the main question is: Is this a per-site, or a per-account effect? Would the low-performing ads on my generic blog be having bad effects on my more carefully focussed niche sites?

Thanks!
Drew.