All I can do is assess the value from Manchester United perspective. Whatever Chelsea do, they may have a different criteria, and different financial assets.
I think it comes from really liking literary forms. Poetry is very beautiful, but the space on the page can be as affecting as where the text is. Like when Miles Davis doesn't play, it has a poignancy to it.
I've always held the view that great states need strategic space. I mean, George Washington took his space from George III. Britain took it from just about everybody. Russia took all of Eastern Europe. Germany's taken it from everywhere they can, and China will want its space too.