User blog comment:Brandon Rhea/Ad Tests on Fandom/@comment-26261914-20170428210404/@comment-3312380-20170429231040

I am not so sure that is a problem. Floating userboxes do the same thing and actually go over text but people still read profiles.

Besides, once wikia sites are used to being viewed, it shouldn't really matter what format it is. The fandom is what draws people.

The only thought I had about them is that some wiki's use the side bar for major links like reporting vandalism. It seems that the adds take up that space (not that there isn't any other options).