How does Yahoo determine how much you earn for an advertisement on your page? Does the advertiser get to choose the amount paid or what?
The advertiser bids how much they are willing to pay per click, yahoo takes a cut, and you get the rest.
Then other advertisers would outbid them, and since the high bid is what shows, the advertiser bidding the lowest wouldn't receive any clicks.
I have a yahoo publisher site in a fairly high paying category and I was getting some MFA low bidders when I knew there were much higher bidders who could have occupied my ad space. Stupid subdomain info sites which bid 11 cents per click. I filtered those out.