User blog comment:Sannse/Important Updates on Wikia’s New Look/@comment-1689515-20100929202823/@comment-1689515-20100929204009

It doesn't take anything away from the center. All it does is let the page content scale, rather than wasting a ton of space on empty margins. If ads are going to be put in the center of the page, putting them in the content pane will actually give them MORE room.