User blog comment:Lancer1289/Wikia's New Skin, the countdown begins/@comment-2256917-20100928212824/@comment-2088100-20100928213701

Well, the purpose of the skin isn't necessarily to do with ads. Ads exist in Monaco, and it has been against the ToU to remove them.

The new bit added is that you now can't remove anything from the normal user interface. Frankly, it makes sense that they add this part. Otherwise, everyone that's vehemently against the change will just modify their wiki to emulate Monaco as close as possible, which would defeat the purpose of the change.

It's not especially friendly or acting in good faith, but it makes sense.