I see some of you guys like analogies so lets try this one so you can get it:
You like to watch english premier league but the cable operator of your city don't let you get the sport channel alone so you have to contract the cable pack with 40 channels.
But one days out of nothing they take that channel off. And they say you can just watch this cooking channel instead, take it.
in real life, in most countries the operator must give a compensation, here is a example
http://www.telegraphindia.com/1160528/jsp/calcutta/story_88069.jsp#.V7erTPkrLIU
but technically I am donating not purchasing anything so the best i can ask for is an act of good will :)