Earlier quoted context omitted.
Might you or someone else mind explaining how this "bidding component" works? I'm not familiar with it or with the specific bidding models at work - "bid per click * ctr" etc?
Advertisers go to an ad network and configure their campaign with: "I want to show X to users who are Y or are on a site about Y, and I'm willing to pay Z for it". X is just the content of the ad and is usually entirely advertiser-defined. Some ad networks will allow you to do some fancy stuff to help determine the best phrasing or arrangement or whatever of your ad. Z can be in dollars per impression, per click, or…
One follow up question - is the "bid per impression" sort of the campaign of last resort then? In other words its the cheapest type of campaign for an advertiser to run as well as the least profitable for the ad network?
Cheers