I will leave your questions to be answered by the more knowledgeable poeple on here, but let me ask you this... Just because they are looking down, it makes it okay for you to look down? Well, think about it this way... Their legs are all over the place, their heels are up in the sky and a lot of the time they are pinching with their knees... So it makes it okay for you to do all of those things? PS: When I say you, I just mean anyone, not YOU. ;)
Anyways, I am not bashing the upper level riders, as jumping that height is REALLY hard (I mean, I wouldn't know, but I can assume it is hard). I'm just saying, just because the pros do it, doesn't mean you should.
That is just my $0.02 :)
You can never take a Thoroughbred away from a horse crazy girl.