If I was extremely rich, being a pop music lover I would love to see them all. I don't care if they suck or not. But if given my limited finance, I would say Ke$ha and Demi.
I wouldn't pay for any of them. I only see my faves on tour, or other interesting artists. All of these girls I'd rather just listen to the studio versions (or not at all).
Gaga - I'm not gay so I'm not going to go stand and listen to her talk in between each song about self acceptance/ her dug struggle/ her climb to the top/ something about being born some way for 2 Hours (Ain't nobody got time for that)
Kelly Clarkson - I don't like any of her song's accept Miss independent and it will be like going to hear a 1 hour song being played (All her song's sound the same)