Is Seeing Double A Good Thing With Yahoo Publisher Network Ads?

A WebmasterWorld thread named Seeing Double discusses how those who run Yahoo Publisher Network ads on their Web sites, and place two or more ad blocks on the same page, can run into seeing the same two ads on the same page. So basically, if there is an ad for Turbo Tax in the top skyscraper YPN ad, there can also be on directly under it, in a different banner, but on the same page.

Is that a bad thing? Is that something that is done by Yahoo on purpose or is it because YPN is still in beta? I wonder if CTR increases if a Web visitor glances at the ad at the top of the page, and then scrolls down and sees the same ad again. I wonder if this is a strategy which is aimed at making the publishers and Yahoo more money or if it is just a version one thing...

Forum discussion at WebmasterWorld.