A large travel-related forum that I frequent which is a Premium AdSense publisher has recently started displaying AdSense ad units with the same ad/advertiser appearing more than once. I just saw one with 5 ads but only 3 different ads/advertisers. The advertiser with 1 ad appeared in the 5th position. This doesn't seem fair to the advertiser and it looks bad to the visitor.
On my site, which is not Premium, I frequently see the same ads/advertisers appearing in more than one ad unit on a single page, but I've never seen this happen within a single ad unit.
Have any non-Premium AdSense publishers seen the same ad appear more than once in a single ad unit?
