It's a clever marketing strategy, people will post the solution and humans having the nature of overcoming obstacles put infront of them will use it.
It will make money for their partners ATi and nVidia due to their needing high end cards to run Aero. It will also ensure they maintain their market share.
Additionally, it's possible to turn of Aero's 3D effects (Don't know why one would want to but some seem to like using dated things *shrug*)