Why don't more software applications look like clean desks?

Yeah, esp in consumer apps (not so much in business and enterprise apps - they are destined to be cluttered), the uncluttered interface can bring in some real value. Years back when I kept looking at MySpace pages, I thought how can any sane person be on this interface? If it wasn't for clutter, MySpace would have been what Facebook is today.

I thought this would mention probably the most famous application that does look minimalist - the google.com homepage.