After the King of the Bill, Andrew launched another advertising model, "King of the Clock".

The concept is pretty simple, advertisers can become "King of the Clock" by paying $10 and this place their site on the top of the list. Once their ad is live, if somebody bumps it from the "throne," they can simply "rebuy" the spot for an additional $10, creating a kind of race between advertisers to remain on the top.

I found it pretty interesting though I'm not sure what type of traffic this would actually bring to the advertisers.

I just crowned ExoClick, let's see how long it stays there and if it brings any traffic at all.