I've been using yahoo for ppc for some time. I have a question re theories on how things are tracked.
I have a site that only generates revenue from UK traffic - ie I only get paid if the traffic comes from the uk. Hence I have a yahoo UK account - and I send relevant traffic there. Works great.
Now I know that in my yahoo us account I can bid on uk specific terms - and I would probably get traffic to the site ie blue widgets uk - or a particular product that is so uk specific that no-one would search for it from the US. Now is it possible that this traffic will not generate me any income - as the searcher is possibly using a US IP address? Or is it possible they are searching on us yahoo from the uk and I will get paid?