That could be a factor too, I'd imagine - I mean, I love watching
competitions. There would be a difference between watching a competition - or watching a selection of random videos. Not that one cannot find videos that one loves to watch out of competitive context, so to speak - but there won't be the suspense of the competition to them. Maybe that too would make a difference to those who never watched 6.0?
Note: I'm neither a 6.0 nor a CoP adherent as such. I think there are advantages and disadvantages to both systems - however, since CoP is the one actually in place, that is what one would concentrate on. I dislike many things that have already been mentioned - to that I would add "corridors" and "anchoring", which, to my mind, surely defeats the whole notion of fairness.
ETA - Oh, and I'm 43.
ETA - And, of course, my 6.0 contribution:
https://www.youtube.com/watch?v=yf2vbCMLxy8
which is one that I discovered on Youtube much later, so I enjoyed independently of the competition itself.