I'd say a large part is because of Nick Diaz.
Or because GSP normally pulls big numbers.
This is true.. But Diaz really did have a huge part.. mainly people wanting to see dark places GSP smash Diaz
Diaz created the extra buzz, and the crazy thing is he doesn't realize that he's a draw, he's just being himself. This is why Diaz got the shot as opposed to Hendricks, 800k is a lot of buys.
GSP averages 700k buys every time out, no doubt that the Diaz hate (wanting to see him get smashed) helps bump the buys another 100k-150k...I imagine the average Diaz fan streams this for free...
As for Hendricks, I could GSP's numbers going down below average for this fight because of people wanting to avoid a boring fight (sloppy power punches, GSP kos'n Hendricks)
GSP is sure a boring fighter! (sarcasm) no one wants to see him....PPV king!
Like every fight before, the media will have no faith in the WW champ, state that Hendricks has the best chance to win since Shields, yada yada yada, Hendricks has a punchers chance like many before, but will likely be on the wrong end of a stiff jab, leg kick, and takedown, repeat....