Why does this issue keep coming up over and over and over and over and over? We should just pin this topic to the top of the forum as an example. I think we repeat more than the show.
The show edits creatively. It's a given that they ALL repeat, they all did last year except Dave Mordal (who paid the price), and that we see unequal amounts of repeating due to a number of factors:
a.) who the producers want to show in a good light
b.) who has "hooks" or pauses in their material which prevent or encourage the ability to edit aggressively and show different portions. For example, in many cases it's outright impossible to edit out the opening lines of an act--so if a comic doesn't realize that and does identical openings instead of simply shuffling the order of his or her jokes... he or she is pretty much locked into a lot of seeming "repeats".
c.) just plain randomness