That is what Gordon Galbraith said in response to this video and he called it a fake.He was working the day Christine did what she did and he was also the last person she talked to before going on the air that morning.
It's in another post on page 60. Dycaite posted it, I believe.
In response to your first point, this video first surfaced here:
https://www.youtube.com/watch?v=8agGtFmAJFQ
Why would the Christine Chubbuck video surface in a compilation video on youtube, all about LOST video footage? It wouldn't. The uploader re-enacted this in the hopes that they would get hits to their video, which would drive up their subscriber base, which would get them more hits and, on youtube, with monteziation turned on (and ads playing before and/or during), money.
That would be the gain.
Your second point is extremely unlikely and I very much doubt the third.
Over at Lost Media Wiki's forum someone posted every frame. If you all would like to look at it yourselves:
http://forums.lostmediawiki.com/post/7922/thread copy and paste the link there into your browser, unzip the file and have a look.