Having been on the other side of this in a previous P9 challenge, I must admit it was originally somewhat disheartening to watch the replay and discover that I was facing down 2 players, plus a third over Skype.
That said, I know that I personally got a lot out of being able to re-watch that match from my opponent's point of view; to hear the considerations of his lines, see what he had, and especially to hear the debate between different lines. It was a wealth of valuable information that you just cannot get anywhere else. I was able to easily pick out my (very) loose plays, see where I had my windows, and when they closed. I lost the match, but was able to get a heck of a return on that loss.
My two cents: I definitely wouldn't want to see an end to the way that Vintage has been streamed recently -- the community, entertainment and educational value provided is far and away worth more than the occasional feelbads.