Well, it's currently a free service for Britons. (I guess they assume you all pay your TV license.) They probably don't have a good way to charge people.

Relatedly, can non-Americans watch videos on American network web sites, like, for example, ABC's Better Off Ted or CBS's Harper's Island or NBC's 30 Rock or Fox's Fringe, or even stuff on Hulu, like, let's say, It's Always Sunny in Philadelphia?