If you read the back of the licence, you will find that you are actually paying for the privilege of owning the television equipment. Whereas years ago it was commonly thought to be funding for the BBC, I think the goal post have now been moved and you have to pay even if you somehow managed to remove the BBC channel from your set, as you are not now paying for that alone!
On a final note, it would be wonderful if other goverment bodies like the CSA were as effecient as the TV licence policing! At one point in time, the largest majority of women in prision, were in for non payment of TV licence!!!