Just to add one extra point that I have said before:
Not everything is available in DVD and many very interesting stuff is not. And some stuff is very hard to have access to, unless you download. A few examples:
1) The complete series "The Wonder Years". Here in Brazil they pass on Satellite TV but the episodes are shown out of order, they don't show all of them, plus you have to have the time to capture end encode everyday (I don't have)
2) The documentary "Brazil Beyond Citizen Kane", that a power media organization forbided in Brazil because it was about them.
3) The Original "American Life" Madonna video, which somehow made a critic to Iraq war. MTV does not show the original version anymore.
4) Some rare beatles musicals.
5) Some musicals, like the Beyonce and Santana performance in superbowl opening, aired in ABC and not anywhereelse.
6) A very rare stanley kubric movie, which was never even on VHS.
The list goes on and on.