I've seen several shows more than once:
The Rat Pack is Back - maybe 6 or 7 times
Legends in Concert - at least 5 times
Vegas The Show - 4 times
V - twice
Mystere - twice
Blue Man Group - twice
Although it's not a production show, I've probably seen Big Elvis 7 or 8 times.
And this summer, I'll probably see either Human Nature or Hitzville, both of which will be repeat performances.
I like music, whcih explains several of those repeats.
I've never seen a show and not enjoyed it at least as much the 2nd (or 3rd or 4th...) times as I did the first time. And there aren't really any shows in Vegas that I want to see but haven't, so at this point, I pretty much have either repeat performances or going and not seeing any shows.