I just buy the ones I want and the DVDS always have all of the fights including the unaired prelims but they often cut out the ring entrances and in between filler.
There aren't many fights you can't fight on the internet if you try hard enough. I'd like to see the UFC be a bit more accommodating by uploading some classics to youtube. They'd get plenty of views, and they'd make back in advertising anything they'd lose from not charging for the fights.
Probably, but the only thing I don't like about watching fights I've never seen before on YouTube is the timer at the bottom of the video screen. Watching a fight without knowing the result gives it a little extra and knowing that possible finish isn't coming for 15 + minutes of footage takes a bit away from it, in my opinion. Like with older seasons of T.U.F., you could tell whether or not a fight was going to go to a decision with pretty good accuracy by the time the fight actually started. Got 10 minutes left to go in the show? It's a fight that's finished. 20-25? Decision (more than likely) or a very late finish.