User blog comment:Brandon Rhea/Ad Tests on Fandom/@comment-26261914-20170428210404

In an marketing point of view, this is good. The ad will always be on screen, and since viewers read from left to right, the text will guide their eyes toward the ad.

However, on the other end, this makes the ad feel extremly forced (And NOBODY likes that). On top of that, it distracts the viewer from the page itself. So while this is a good idea in theory, I think this can turn out horibly for the viewers, Fandom, and even the advertisements/advertisers.